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HomeMy WebLinkAbout21-158 HydroCAD Report DA1 to DA61S Drainage Area DA1 PROP 1P Low area drainage catchment Routing Diagram for 150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 2HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 Barn Cty 2 Yr Type III 24-hr Default 24.00 1 3.39 2 2 Barn Cty 10 Yr Type III 24-hr Default 24.00 1 4.95 2 3 Barn Cty 25 Yr Type III 24-hr Default 24.00 1 5.92 2 4 Barn Cty 50 yr. Type III 24-hr Default 24.00 1 6.65 2 5 Barn Cty 100 yr Type III 24-hr Default 24.00 1 7.80 2 Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 3HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (sq-ft) CN Description (subcatchment-numbers) 6,330 55 Pervious gravel driveway (1S) 25,597 32 Woods/grass comb., Good, HSG A (1S) 31,927 37 TOTAL AREA Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 4HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (sq-ft) Soil Group Subcatchment Numbers 25,597 HSG A 1S 0 HSG B 0 HSG C 0 HSG D 6,330 Other 1S 31,927 TOTAL AREA Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 5HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (sq-ft) HSG-B (sq-ft) HSG-C (sq-ft) HSG-D (sq-ft) Other (sq-ft) Total (sq-ft) Ground Cover Subcatchment Numbers 0 0 0 0 6,330 6,330 Pervious gravel driveway 25,597 0 0 0 0 25,597 Woods/grass comb., Good 25,597 0 0 0 6,330 31,927 TOTAL AREA Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 6HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Notes Listing (all nodes) Line# Node Number Notes 1 1S Time of Concentration 2 1P Low drainage area 3"/hr infiltration rate model Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 7HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=31,927 sf 0.00% Impervious Runoff Depth=0.00"Subcatchment 1S: Drainage Area DA1 PROP Tc=5.0 min CN=37 Runoff=0.00 cfs 0 cf Peak Elev=4.50' Storage=0 cf Inflow=0.00 cfs 0 cfPond 1P: Low area drainage catchment Outflow=0.00 cfs 0 cf Total Runoff Area = 31,927 sf Runoff Volume = 0 cf Average Runoff Depth = 0.00" 100.00% Pervious = 31,927 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 8HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA1 PROP Time of Concentration Runoff = 0.00 cfs @ 1.00 hrs, Volume= 0 cf, Depth= 0.00" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 2 Yr Rainfall=3.39" Area (sf) CN Description 25,597 32 Woods/grass comb., Good, HSG A * 0 98 Roof area * 6,330 55 Pervious gravel driveway 31,927 37 Weighted Average 31,927 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA1 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)1 0 Type III 24-hr Barn Cty 2 Yr Rainfall=3.39" Runoff Area=31,927 sf Runoff Volume=0 cf Runoff Depth=0.00" Tc=5.0 min CN=37 0.00 cfs Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 9HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 31,927 sf, 0.00% Impervious, Inflow Depth = 0.00" for Barn Cty 2 Yr event Inflow = 0.00 cfs @ 1.00 hrs, Volume= 0 cf Outflow = 0.00 cfs @ 1.00 hrs, Volume= 0 cf, Atten= 0%, Lag= 0.0 min Primary = 0.00 cfs @ 1.00 hrs, Volume= 0 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.50' @ 1.00 hrs Storage= 0 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no inflow) Volume Invert Avail.Storage Storage Description #1 4.50' 3,337 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.50 0 5.00 1,204 5.50 3,337 Device Routing Invert Outlet Devices #1 Primary 4.40'Infiltration Model Elev. (feet) 4.40 4.50 5.00 5.50 Disch. (cfs) 0.000 0.090 0.220 0.350 Primary OutFlow Max=0.00 cfs @ 1.00 hrs HW=4.50' (Free Discharge) 1=Infiltration Model (Passes 0.00 cfs of 0.09 cfs potential flow) Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 10HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)1 0 Inflow Area=31,927 sf Peak Elev=4.50' Storage=0 cf 0.00 cfs 0.00 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.340.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 11HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 3,2003,0002,8002,6002,4002,2002,0001,8001,6001,4001,2001,0008006004002000Elevation (feet)5 Infiltration System Storage Model Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 12HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=31,927 sf 0.00% Impervious Runoff Depth>0.13"Subcatchment 1S: Drainage Area DA1 PROP Tc=5.0 min CN=37 Runoff=0.01 cfs 340 cf Peak Elev=4.50' Storage=3 cf Inflow=0.01 cfs 340 cfPond 1P: Low area drainage catchment Outflow=0.01 cfs 339 cf Total Runoff Area = 31,927 sf Runoff Volume = 340 cf Average Runoff Depth = 0.13" 100.00% Pervious = 31,927 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 13HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA1 PROP Time of Concentration Runoff = 0.01 cfs @ 14.64 hrs, Volume= 340 cf, Depth> 0.13" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 10 Yr Rainfall=4.95" Area (sf) CN Description 25,597 32 Woods/grass comb., Good, HSG A * 0 98 Roof area * 6,330 55 Pervious gravel driveway 31,927 37 Weighted Average 31,927 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA1 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.014 0.013 0.012 0.011 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0 Type III 24-hr Barn Cty 10 Yr Rainfall=4.95" Runoff Area=31,927 sf Runoff Volume=340 cf Runoff Depth>0.13" Tc=5.0 min CN=37 0.01 cfs Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 14HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 31,927 sf, 0.00% Impervious, Inflow Depth > 0.13" for Barn Cty 10 Yr event Inflow = 0.01 cfs @ 14.64 hrs, Volume= 340 cf Outflow = 0.01 cfs @ 14.70 hrs, Volume= 339 cf, Atten= 0%, Lag= 3.4 min Primary = 0.01 cfs @ 14.70 hrs, Volume= 339 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.50' @ 14.70 hrs Storage= 3 cf Plug-Flow detention time= 4.3 min calculated for 339 cf (100% of inflow) Center-of-Mass det. time= 2.8 min ( 1,049.3 - 1,046.4 ) Volume Invert Avail.Storage Storage Description #1 4.50' 3,337 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.50 0 5.00 1,204 5.50 3,337 Device Routing Invert Outlet Devices #1 Primary 4.40'Infiltration Model Elev. (feet) 4.40 4.50 5.00 5.50 Disch. (cfs) 0.000 0.090 0.220 0.350 Primary OutFlow Max=0.09 cfs @ 14.70 hrs HW=4.50' (Free Discharge) 1=Infiltration Model (Custom Controls 0.09 cfs) Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 15HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.014 0.013 0.012 0.011 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0 Inflow Area=31,927 sf Peak Elev=4.50' Storage=3 cf 0.01 cfs 0.01 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.340.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 16HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 3,2003,0002,8002,6002,4002,2002,0001,8001,6001,4001,2001,0008006004002000Elevation (feet)5 Infiltration System Storage Model Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 17HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=31,927 sf 0.00% Impervious Runoff Depth>0.32"Subcatchment 1S: Drainage Area DA1 PROP Tc=5.0 min CN=37 Runoff=0.07 cfs 859 cf Peak Elev=4.51' Storage=17 cf Inflow=0.07 cfs 859 cfPond 1P: Low area drainage catchment Outflow=0.07 cfs 856 cf Total Runoff Area = 31,927 sf Runoff Volume = 859 cf Average Runoff Depth = 0.32" 100.00% Pervious = 31,927 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 18HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA1 PROP Time of Concentration Runoff = 0.07 cfs @ 12.39 hrs, Volume= 859 cf, Depth> 0.32" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 25 Yr Rainfall=5.92" Area (sf) CN Description 25,597 32 Woods/grass comb., Good, HSG A * 0 98 Roof area * 6,330 55 Pervious gravel driveway 31,927 37 Weighted Average 31,927 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA1 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr Barn Cty 25 Yr Rainfall=5.92" Runoff Area=31,927 sf Runoff Volume=859 cf Runoff Depth>0.32" Tc=5.0 min CN=37 0.07 cfs Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 19HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 31,927 sf, 0.00% Impervious, Inflow Depth > 0.32" for Barn Cty 25 Yr event Inflow = 0.07 cfs @ 12.39 hrs, Volume= 859 cf Outflow = 0.07 cfs @ 12.46 hrs, Volume= 856 cf, Atten= 7%, Lag= 4.4 min Primary = 0.07 cfs @ 12.46 hrs, Volume= 856 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.51' @ 12.46 hrs Storage= 17 cf Plug-Flow detention time= 4.3 min calculated for 856 cf (100% of inflow) Center-of-Mass det. time= 3.1 min ( 984.8 - 981.8 ) Volume Invert Avail.Storage Storage Description #1 4.50' 3,337 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.50 0 5.00 1,204 5.50 3,337 Device Routing Invert Outlet Devices #1 Primary 4.40'Infiltration Model Elev. (feet) 4.40 4.50 5.00 5.50 Disch. (cfs) 0.000 0.090 0.220 0.350 Primary OutFlow Max=0.09 cfs @ 12.46 hrs HW=4.51' (Free Discharge) 1=Infiltration Model (Custom Controls 0.09 cfs) Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 20HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=31,927 sf Peak Elev=4.51' Storage=17 cf 0.07 cfs 0.07 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.340.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 21HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 3,2003,0002,8002,6002,4002,2002,0001,8001,6001,4001,2001,0008006004002000Elevation (feet)5 Infiltration System Storage Model Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 22HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=31,927 sf 0.00% Impervious Runoff Depth>0.52"Subcatchment 1S: Drainage Area DA1 PROP Tc=5.0 min CN=37 Runoff=0.16 cfs 1,378 cf Peak Elev=4.53' Storage=79 cf Inflow=0.16 cfs 1,378 cfPond 1P: Low area drainage catchment Outflow=0.10 cfs 1,375 cf Total Runoff Area = 31,927 sf Runoff Volume = 1,378 cf Average Runoff Depth = 0.52" 100.00% Pervious = 31,927 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 23HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA1 PROP Time of Concentration Runoff = 0.16 cfs @ 12.32 hrs, Volume= 1,378 cf, Depth> 0.52" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 50 yr. Rainfall=6.65" Area (sf) CN Description 25,597 32 Woods/grass comb., Good, HSG A * 0 98 Roof area * 6,330 55 Pervious gravel driveway 31,927 37 Weighted Average 31,927 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA1 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type III 24-hr Barn Cty 50 yr. Rainfall=6.65" Runoff Area=31,927 sf Runoff Volume=1,378 cf Runoff Depth>0.52" Tc=5.0 min CN=37 0.16 cfs Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 24HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 31,927 sf, 0.00% Impervious, Inflow Depth > 0.52" for Barn Cty 50 yr. event Inflow = 0.16 cfs @ 12.32 hrs, Volume= 1,378 cf Outflow = 0.10 cfs @ 12.54 hrs, Volume= 1,375 cf, Atten= 38%, Lag= 13.1 min Primary = 0.10 cfs @ 12.54 hrs, Volume= 1,375 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.53' @ 12.54 hrs Storage= 79 cf Plug-Flow detention time= 5.6 min calculated for 1,375 cf (100% of inflow) Center-of-Mass det. time= 4.5 min ( 958.1 - 953.6 ) Volume Invert Avail.Storage Storage Description #1 4.50' 3,337 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.50 0 5.00 1,204 5.50 3,337 Device Routing Invert Outlet Devices #1 Primary 4.40'Infiltration Model Elev. (feet) 4.40 4.50 5.00 5.50 Disch. (cfs) 0.000 0.090 0.220 0.350 Primary OutFlow Max=0.10 cfs @ 12.54 hrs HW=4.53' (Free Discharge) 1=Infiltration Model (Custom Controls 0.10 cfs) Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 25HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=31,927 sf Peak Elev=4.53' Storage=79 cf 0.16 cfs 0.10 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.340.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 26HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 3,2003,0002,8002,6002,4002,2002,0001,8001,6001,4001,2001,0008006004002000Elevation (feet)5 Infiltration System Storage Model Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 27HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=31,927 sf 0.00% Impervious Runoff Depth>0.90"Subcatchment 1S: Drainage Area DA1 PROP Tc=5.0 min CN=37 Runoff=0.41 cfs 2,394 cf Peak Elev=4.66' Storage=376 cf Inflow=0.41 cfs 2,394 cfPond 1P: Low area drainage catchment Outflow=0.13 cfs 2,389 cf Total Runoff Area = 31,927 sf Runoff Volume = 2,394 cf Average Runoff Depth = 0.90" 100.00% Pervious = 31,927 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 28HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA1 PROP Time of Concentration Runoff = 0.41 cfs @ 12.12 hrs, Volume= 2,394 cf, Depth> 0.90" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 100 yr Rainfall=7.80" Area (sf) CN Description 25,597 32 Woods/grass comb., Good, HSG A * 0 98 Roof area * 6,330 55 Pervious gravel driveway 31,927 37 Weighted Average 31,927 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA1 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr Barn Cty 100 yr Rainfall=7.80" Runoff Area=31,927 sf Runoff Volume=2,394 cf Runoff Depth>0.90" Tc=5.0 min CN=37 0.41 cfs Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 29HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 31,927 sf, 0.00% Impervious, Inflow Depth > 0.90" for Barn Cty 100 yr event Inflow = 0.41 cfs @ 12.12 hrs, Volume= 2,394 cf Outflow = 0.13 cfs @ 12.73 hrs, Volume= 2,389 cf, Atten= 68%, Lag= 36.6 min Primary = 0.13 cfs @ 12.73 hrs, Volume= 2,389 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.66' @ 12.73 hrs Storage= 376 cf Plug-Flow detention time= 22.2 min calculated for 2,389 cf (100% of inflow) Center-of-Mass det. time= 21.2 min ( 946.4 - 925.2 ) Volume Invert Avail.Storage Storage Description #1 4.50' 3,337 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.50 0 5.00 1,204 5.50 3,337 Device Routing Invert Outlet Devices #1 Primary 4.40'Infiltration Model Elev. (feet) 4.40 4.50 5.00 5.50 Disch. (cfs) 0.000 0.090 0.220 0.350 Primary OutFlow Max=0.13 cfs @ 12.73 hrs HW=4.66' (Free Discharge) 1=Infiltration Model (Custom Controls 0.13 cfs) Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 30HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=31,927 sf Peak Elev=4.66' Storage=376 cf 0.41 cfs 0.13 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.340.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc Page 31HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 3,2003,0002,8002,6002,4002,2002,0001,8001,6001,4001,2001,0008006004002000Elevation (feet)5 Infiltration System Storage Model Revised proposed conditions DA P1C:\Users\Public\Documents\HydroCAD\Projects\ Table of Contents150 SOUTH ST PROP DA P1 rev Prepared by Down Cape Engineering Inc HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (all nodes) 4 Soil Listing (all nodes) 5 Ground Covers (all nodes) 6 Notes Listing (all nodes) Barn Cty 2 Yr Event 7 Node Listing 8 Subcat 1S: Drainage Area DA1 PROP 9 Pond 1P: Low area drainage catchment Barn Cty 10 Yr Event 12 Node Listing 13 Subcat 1S: Drainage Area DA1 PROP 14 Pond 1P: Low area drainage catchment Barn Cty 25 Yr Event 17 Node Listing 18 Subcat 1S: Drainage Area DA1 PROP 19 Pond 1P: Low area drainage catchment Barn Cty 50 yr. Event 22 Node Listing 23 Subcat 1S: Drainage Area DA1 PROP 24 Pond 1P: Low area drainage catchment Barn Cty 100 yr Event 27 Node Listing 28 Subcat 1S: Drainage Area DA1 PROP 29 Pond 1P: Low area drainage catchment 1S Drainage Area DA2 PROP ROOF 1P Roof Drywells Routing Diagram for 150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 2HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 Barn Cty 2 Yr Type III 24-hr Default 24.00 1 3.39 2 2 Barn Cty 10 Yr Type III 24-hr Default 24.00 1 4.95 2 3 Barn Cty 25 Yr Type III 24-hr Default 24.00 1 5.92 2 4 Barn Cty 50 yr. Type III 24-hr Default 24.00 1 6.65 2 5 Barn Cty 100 yr Type III 24-hr Default 24.00 1 7.80 2 Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 3HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (sq-ft) CN Description (subcatchment-numbers) 5,760 98 Roof area (1S) 5,760 98 TOTAL AREA Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 4HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (sq-ft) Soil Group Subcatchment Numbers 0 HSG A 0 HSG B 0 HSG C 0 HSG D 5,760 Other 1S 5,760 TOTAL AREA Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 5HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (sq-ft) HSG-B (sq-ft) HSG-C (sq-ft) HSG-D (sq-ft) Other (sq-ft) Total (sq-ft) Ground Cover Subcatchment Numbers 0 0 0 0 5,760 5,760 Roof area 1 S 0 0 0 0 5,760 5,760 TOTAL AREA Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 6HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Notes Listing (all nodes) Line# Node Number Notes 1 1S Time of Concentration 2 1P Low drainage area 3"/hr infiltration rate model Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 7HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=5,760 sf 100.00% Impervious Runoff Depth>3.15"Subcatchment 1S: Drainage Area DA2 Tc=5.0 min CN=98 Runoff=0.45 cfs 1,514 cf Peak Elev=3.85' Storage=69 cf Inflow=0.45 cfs 1,514 cfPond 1P: Roof Drywells Outflow=0.35 cfs 1,514 cf Total Runoff Area = 5,760 sf Runoff Volume = 1,514 cf Average Runoff Depth = 3.15" 0.00% Pervious = 0 sf 100.00% Impervious = 5,760 sf Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 8HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA2 PROP ROOF Time of Concentration Runoff = 0.45 cfs @ 12.07 hrs, Volume= 1,514 cf, Depth> 3.15" Routed to Pond 1P : Roof Drywells Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 2 Yr Rainfall=3.39" Area (sf) CN Description 0 32 Woods/grass comb., Good, HSG A * 5,760 98 Roof area * 0 55 Pervious gravel driveway 5,760 98 Weighted Average 5,760 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA2 PROP ROOF Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr Barn Cty 2 Yr Rainfall=3.39" Runoff Area=5,760 sf Runoff Volume=1,514 cf Runoff Depth>3.15" Tc=5.0 min CN=98 0.45 cfs Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 9HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Roof Drywells Low drainage area 3"/hr infiltration rate model Inflow Area = 5,760 sf,100.00% Impervious, Inflow Depth > 3.15" for Barn Cty 2 Yr event Inflow = 0.45 cfs @ 12.07 hrs, Volume= 1,514 cf Outflow = 0.35 cfs @ 12.13 hrs, Volume= 1,514 cf, Atten= 23%, Lag= 3.6 min Primary = 0.35 cfs @ 12.13 hrs, Volume= 1,514 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 3.85' @ 12.13 hrs Storage= 69 cf Plug-Flow detention time= 1.2 min calculated for 1,513 cf (100% of inflow) Center-of-Mass det. time= 1.1 min ( 754.9 - 753.8 ) Volume Invert Avail.Storage Storage Description #1 3.00' 500 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 3.00 0 4.00 81 5.00 161 6.00 500 Device Routing Invert Outlet Devices #1 Primary 3.00'Infiltration Model Elev. (feet) 3.00 3.10 4.00 5.00 6.00 Disch. (cfs) 0.000 0.190 0.380 0.770 0.880 Primary OutFlow Max=0.35 cfs @ 12.13 hrs HW=3.85' (Free Discharge) 1=Infiltration Model (Custom Controls 0.35 cfs) Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 10HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Roof Drywells Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=5,760 sf Peak Elev=3.85' Storage=69 cf 0.45 cfs 0.35 cfs Pond 1P: Roof Drywells Primary Stage-Discharge Discharge (cfs) 0.850.80.750.70.650.60.550.50.450.40.350.30.250.20.150.10.050Elevation (feet)6 5 4 3 Infiltration Model Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 11HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Roof Drywells Storage Stage-Area-Storage Storage (cubic-feet) 500480460440420400380360340320300280260240220200180160140120100806040200Elevation (feet)6 5 4 3 Infiltration System Storage Model Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 12HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=5,760 sf 100.00% Impervious Runoff Depth>4.71"Subcatchment 1S: Drainage Area DA2 Tc=5.0 min CN=98 Runoff=0.66 cfs 2,261 cf Peak Elev=4.45' Storage=117 cf Inflow=0.66 cfs 2,261 cfPond 1P: Roof Drywells Outflow=0.56 cfs 2,261 cf Total Runoff Area = 5,760 sf Runoff Volume = 2,261 cf Average Runoff Depth = 4.71" 0.00% Pervious = 0 sf 100.00% Impervious = 5,760 sf Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 13HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA2 PROP ROOF Time of Concentration Runoff = 0.66 cfs @ 12.07 hrs, Volume= 2,261 cf, Depth> 4.71" Routed to Pond 1P : Roof Drywells Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 10 Yr Rainfall=4.95" Area (sf) CN Description 0 32 Woods/grass comb., Good, HSG A * 5,760 98 Roof area * 0 55 Pervious gravel driveway 5,760 98 Weighted Average 5,760 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA2 PROP ROOF Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr Barn Cty 10 Yr Rainfall=4.95" Runoff Area=5,760 sf Runoff Volume=2,261 cf Runoff Depth>4.71" Tc=5.0 min CN=98 0.66 cfs Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 14HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Roof Drywells Low drainage area 3"/hr infiltration rate model Inflow Area = 5,760 sf,100.00% Impervious, Inflow Depth > 4.71" for Barn Cty 10 Yr event Inflow = 0.66 cfs @ 12.07 hrs, Volume= 2,261 cf Outflow = 0.56 cfs @ 12.12 hrs, Volume= 2,261 cf, Atten= 16%, Lag= 2.9 min Primary = 0.56 cfs @ 12.12 hrs, Volume= 2,261 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.45' @ 12.12 hrs Storage= 117 cf Plug-Flow detention time= 1.5 min calculated for 2,261 cf (100% of inflow) Center-of-Mass det. time= 1.4 min ( 748.2 - 746.8 ) Volume Invert Avail.Storage Storage Description #1 3.00' 500 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 3.00 0 4.00 81 5.00 161 6.00 500 Device Routing Invert Outlet Devices #1 Primary 3.00'Infiltration Model Elev. (feet) 3.00 3.10 4.00 5.00 6.00 Disch. (cfs) 0.000 0.190 0.380 0.770 0.880 Primary OutFlow Max=0.56 cfs @ 12.12 hrs HW=4.45' (Free Discharge) 1=Infiltration Model (Custom Controls 0.56 cfs) Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 15HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Roof Drywells Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=5,760 sf Peak Elev=4.45' Storage=117 cf 0.66 cfs 0.56 cfs Pond 1P: Roof Drywells Primary Stage-Discharge Discharge (cfs) 0.850.80.750.70.650.60.550.50.450.40.350.30.250.20.150.10.050Elevation (feet)6 5 4 3 Infiltration Model Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 16HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Roof Drywells Storage Stage-Area-Storage Storage (cubic-feet) 500480460440420400380360340320300280260240220200180160140120100806040200Elevation (feet)6 5 4 3 Infiltration System Storage Model Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 17HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=5,760 sf 100.00% Impervious Runoff Depth>5.68"Subcatchment 1S: Drainage Area DA2 Tc=5.0 min CN=98 Runoff=0.79 cfs 2,725 cf Peak Elev=4.77' Storage=142 cf Inflow=0.79 cfs 2,725 cfPond 1P: Roof Drywells Outflow=0.68 cfs 2,725 cf Total Runoff Area = 5,760 sf Runoff Volume = 2,725 cf Average Runoff Depth = 5.68" 0.00% Pervious = 0 sf 100.00% Impervious = 5,760 sf Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 18HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA2 PROP ROOF Time of Concentration Runoff = 0.79 cfs @ 12.07 hrs, Volume= 2,725 cf, Depth> 5.68" Routed to Pond 1P : Roof Drywells Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 25 Yr Rainfall=5.92" Area (sf) CN Description 0 32 Woods/grass comb., Good, HSG A * 5,760 98 Roof area * 0 55 Pervious gravel driveway 5,760 98 Weighted Average 5,760 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA2 PROP ROOF Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr Barn Cty 25 Yr Rainfall=5.92" Runoff Area=5,760 sf Runoff Volume=2,725 cf Runoff Depth>5.68" Tc=5.0 min CN=98 0.79 cfs Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 19HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Roof Drywells Low drainage area 3"/hr infiltration rate model Inflow Area = 5,760 sf,100.00% Impervious, Inflow Depth > 5.68" for Barn Cty 25 Yr event Inflow = 0.79 cfs @ 12.07 hrs, Volume= 2,725 cf Outflow = 0.68 cfs @ 12.12 hrs, Volume= 2,725 cf, Atten= 14%, Lag= 2.7 min Primary = 0.68 cfs @ 12.12 hrs, Volume= 2,725 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.77' @ 12.12 hrs Storage= 142 cf Plug-Flow detention time= 1.6 min calculated for 2,724 cf (100% of inflow) Center-of-Mass det. time= 1.5 min ( 745.6 - 744.1 ) Volume Invert Avail.Storage Storage Description #1 3.00' 500 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 3.00 0 4.00 81 5.00 161 6.00 500 Device Routing Invert Outlet Devices #1 Primary 3.00'Infiltration Model Elev. (feet) 3.00 3.10 4.00 5.00 6.00 Disch. (cfs) 0.000 0.190 0.380 0.770 0.880 Primary OutFlow Max=0.68 cfs @ 12.12 hrs HW=4.77' (Free Discharge) 1=Infiltration Model (Custom Controls 0.68 cfs) Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 20HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Roof Drywells Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=5,760 sf Peak Elev=4.77' Storage=142 cf 0.79 cfs 0.68 cfs Pond 1P: Roof Drywells Primary Stage-Discharge Discharge (cfs) 0.850.80.750.70.650.60.550.50.450.40.350.30.250.20.150.10.050Elevation (feet)6 5 4 3 Infiltration Model Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 21HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Roof Drywells Storage Stage-Area-Storage Storage (cubic-feet) 500480460440420400380360340320300280260240220200180160140120100806040200Elevation (feet)6 5 4 3 Infiltration System Storage Model Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 22HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=5,760 sf 100.00% Impervious Runoff Depth>6.41"Subcatchment 1S: Drainage Area DA2 Tc=5.0 min CN=98 Runoff=0.89 cfs 3,075 cf Peak Elev=5.00' Storage=161 cf Inflow=0.89 cfs 3,075 cfPond 1P: Roof Drywells Outflow=0.77 cfs 3,074 cf Total Runoff Area = 5,760 sf Runoff Volume = 3,075 cf Average Runoff Depth = 6.41" 0.00% Pervious = 0 sf 100.00% Impervious = 5,760 sf Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 23HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA2 PROP ROOF Time of Concentration Runoff = 0.89 cfs @ 12.07 hrs, Volume= 3,075 cf, Depth> 6.41" Routed to Pond 1P : Roof Drywells Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 50 yr. Rainfall=6.65" Area (sf) CN Description 0 32 Woods/grass comb., Good, HSG A * 5,760 98 Roof area * 0 55 Pervious gravel driveway 5,760 98 Weighted Average 5,760 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA2 PROP ROOF Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)1 0 Type III 24-hr Barn Cty 50 yr. Rainfall=6.65" Runoff Area=5,760 sf Runoff Volume=3,075 cf Runoff Depth>6.41" Tc=5.0 min CN=98 0.89 cfs Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 24HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Roof Drywells Low drainage area 3"/hr infiltration rate model Inflow Area = 5,760 sf,100.00% Impervious, Inflow Depth > 6.41" for Barn Cty 50 yr. event Inflow = 0.89 cfs @ 12.07 hrs, Volume= 3,075 cf Outflow = 0.77 cfs @ 12.11 hrs, Volume= 3,074 cf, Atten= 14%, Lag= 2.6 min Primary = 0.77 cfs @ 12.11 hrs, Volume= 3,074 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 5.00' @ 12.11 hrs Storage= 161 cf Plug-Flow detention time= 1.6 min calculated for 3,074 cf (100% of inflow) Center-of-Mass det. time= 1.5 min ( 744.0 - 742.5 ) Volume Invert Avail.Storage Storage Description #1 3.00' 500 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 3.00 0 4.00 81 5.00 161 6.00 500 Device Routing Invert Outlet Devices #1 Primary 3.00'Infiltration Model Elev. (feet) 3.00 3.10 4.00 5.00 6.00 Disch. (cfs) 0.000 0.190 0.380 0.770 0.880 Primary OutFlow Max=0.77 cfs @ 12.11 hrs HW=5.00' (Free Discharge) 1=Infiltration Model (Custom Controls 0.77 cfs) Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 25HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Roof Drywells Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)1 0 Inflow Area=5,760 sf Peak Elev=5.00' Storage=161 cf 0.89 cfs 0.77 cfs Pond 1P: Roof Drywells Primary Stage-Discharge Discharge (cfs) 0.850.80.750.70.650.60.550.50.450.40.350.30.250.20.150.10.050Elevation (feet)6 5 4 3 Infiltration Model Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 26HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Roof Drywells Storage Stage-Area-Storage Storage (cubic-feet) 500480460440420400380360340320300280260240220200180160140120100806040200Elevation (feet)6 5 4 3 Infiltration System Storage Model Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 27HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=5,760 sf 100.00% Impervious Runoff Depth>7.55"Subcatchment 1S: Drainage Area DA2 Tc=5.0 min CN=98 Runoff=1.05 cfs 3,625 cf Peak Elev=5.15' Storage=211 cf Inflow=1.05 cfs 3,625 cfPond 1P: Roof Drywells Outflow=0.79 cfs 3,624 cf Total Runoff Area = 5,760 sf Runoff Volume = 3,625 cf Average Runoff Depth = 7.55" 0.00% Pervious = 0 sf 100.00% Impervious = 5,760 sf Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 28HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA2 PROP ROOF Time of Concentration Runoff = 1.05 cfs @ 12.07 hrs, Volume= 3,625 cf, Depth> 7.55" Routed to Pond 1P : Roof Drywells Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 100 yr Rainfall=7.80" Area (sf) CN Description 0 32 Woods/grass comb., Good, HSG A * 5,760 98 Roof area * 0 55 Pervious gravel driveway 5,760 98 Weighted Average 5,760 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA2 PROP ROOF Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)1 0 Type III 24-hr Barn Cty 100 yr Rainfall=7.80" Runoff Area=5,760 sf Runoff Volume=3,625 cf Runoff Depth>7.55" Tc=5.0 min CN=98 1.05 cfs Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 29HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Roof Drywells Low drainage area 3"/hr infiltration rate model Inflow Area = 5,760 sf,100.00% Impervious, Inflow Depth > 7.55" for Barn Cty 100 yr event Inflow = 1.05 cfs @ 12.07 hrs, Volume= 3,625 cf Outflow = 0.79 cfs @ 12.13 hrs, Volume= 3,624 cf, Atten= 25%, Lag= 3.9 min Primary = 0.79 cfs @ 12.13 hrs, Volume= 3,624 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 5.15' @ 12.13 hrs Storage= 211 cf Plug-Flow detention time= 1.8 min calculated for 3,624 cf (100% of inflow) Center-of-Mass det. time= 1.7 min ( 742.2 - 740.5 ) Volume Invert Avail.Storage Storage Description #1 3.00' 500 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 3.00 0 4.00 81 5.00 161 6.00 500 Device Routing Invert Outlet Devices #1 Primary 3.00'Infiltration Model Elev. (feet) 3.00 3.10 4.00 5.00 6.00 Disch. (cfs) 0.000 0.190 0.380 0.770 0.880 Primary OutFlow Max=0.79 cfs @ 12.13 hrs HW=5.15' (Free Discharge) 1=Infiltration Model (Custom Controls 0.79 cfs) Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 30HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Roof Drywells Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)1 0 Inflow Area=5,760 sf Peak Elev=5.15' Storage=211 cf 1.05 cfs 0.79 cfs Pond 1P: Roof Drywells Primary Stage-Discharge Discharge (cfs) 0.850.80.750.70.650.60.550.50.450.40.350.30.250.20.150.10.050Elevation (feet)6 5 4 3 Infiltration Model Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc Page 31HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Roof Drywells Storage Stage-Area-Storage Storage (cubic-feet) 500480460440420400380360340320300280260240220200180160140120100806040200Elevation (feet)6 5 4 3 Infiltration System Storage Model Revised proposed conditions DA2 RoofC:\Users\Public\Documents\HydroCAD\Projects\ Table of Contents150 SOUTH ST PROP DA P2 rev Prepared by Down Cape Engineering Inc HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (all nodes) 4 Soil Listing (all nodes) 5 Ground Covers (all nodes) 6 Notes Listing (all nodes) Barn Cty 2 Yr Event 7 Node Listing 8 Subcat 1S: Drainage Area DA2 PROP ROOF 9 Pond 1P: Roof Drywells Barn Cty 10 Yr Event 12 Node Listing 13 Subcat 1S: Drainage Area DA2 PROP ROOF 14 Pond 1P: Roof Drywells Barn Cty 25 Yr Event 17 Node Listing 18 Subcat 1S: Drainage Area DA2 PROP ROOF 19 Pond 1P: Roof Drywells Barn Cty 50 yr. Event 22 Node Listing 23 Subcat 1S: Drainage Area DA2 PROP ROOF 24 Pond 1P: Roof Drywells Barn Cty 100 yr Event 27 Node Listing 28 Subcat 1S: Drainage Area DA2 PROP ROOF 29 Pond 1P: Roof Drywells 1S Drainage Area DA3 PROP 1P Low area drainage catchment Routing Diagram for 150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 2HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 Barn Cty 2 Yr Type III 24-hr Default 24.00 1 3.39 2 2 Barn Cty 10 Yr Type III 24-hr Default 24.00 1 4.95 2 3 Barn Cty 25 Yr Type III 24-hr Default 24.00 1 5.92 2 4 Barn Cty 50 yr. Type III 24-hr Default 24.00 1 6.65 2 5 Barn Cty 100 yr Type III 24-hr Default 24.00 1 7.80 2 Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 3HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (sq-ft) CN Description (subcatchment-numbers) 2,875 98 Patio area (1S) 19,482 32 Woods/grass comb., Good, HSG A (1S) 22,357 40 TOTAL AREA Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 4HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (sq-ft) Soil Group Subcatchment Numbers 19,482 HSG A 1S 0 HSG B 0 HSG C 0 HSG D 2,875 Other 1S 22,357 TOTAL AREA Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 5HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (sq-ft) HSG-B (sq-ft) HSG-C (sq-ft) HSG-D (sq-ft) Other (sq-ft) Total (sq-ft) Ground Cover Subcatchment Numbers 0 0 0 0 2,875 2,875 Patio area 19,482 0 0 0 0 19,482 Woods/grass comb., Good 19,482 0 0 0 2,875 22,357 TOTAL AREA Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 6HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Notes Listing (all nodes) Line# Node Number Notes 1 1S Time of Concentration 2 1P Low drainage area 3"/hr infiltration rate model Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 7HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=22,357 sf 12.86% Impervious Runoff Depth>0.01"Subcatchment 1S: Drainage Area DA3 Tc=5.0 min CN=40 Runoff=0.00 cfs 18 cf Peak Elev=6.00' Storage=0 cf Inflow=0.00 cfs 18 cfPond 1P: Low area drainage catchment Outflow=0.00 cfs 18 cf Total Runoff Area = 22,357 sf Runoff Volume = 18 cf Average Runoff Depth = 0.01" 87.14% Pervious = 19,482 sf 12.86% Impervious = 2,875 sf Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 8HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA3 PROP Time of Concentration Runoff = 0.00 cfs @ 22.15 hrs, Volume= 18 cf, Depth> 0.01" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 2 Yr Rainfall=3.39" Area (sf) CN Description 19,482 32 Woods/grass comb., Good, HSG A * 2,875 98 Patio area * 0 55 Pervious gravel driveway 22,357 40 Weighted Average 19,482 87.14% Pervious Area 2,875 12.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA3 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0 0 0 Type III 24-hr Barn Cty 2 Yr Rainfall=3.39" Runoff Area=22,357 sf Runoff Volume=18 cf Runoff Depth>0.01" Tc=5.0 min CN=40 0.00 cfs Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 9HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 22,357 sf, 12.86% Impervious, Inflow Depth > 0.01" for Barn Cty 2 Yr event Inflow = 0.00 cfs @ 22.15 hrs, Volume= 18 cf Outflow = 0.00 cfs @ 22.26 hrs, Volume= 18 cf, Atten= 0%, Lag= 6.2 min Primary = 0.00 cfs @ 22.26 hrs, Volume= 18 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 6.00' @ 22.26 hrs Storage= 0 cf Plug-Flow detention time= 1.3 min calculated for 18 cf (100% of inflow) Center-of-Mass det. time= 0.7 min ( 1,237.8 - 1,237.1 ) Volume Invert Avail.Storage Storage Description #1 6.00' 1,122 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 6.00 0 6.50 1,122 Device Routing Invert Outlet Devices #1 Primary 5.90'Infiltration Model Elev. (feet) 5.90 6.00 6.50 Disch. (cfs) 0.000 0.140 0.173 Primary OutFlow Max=0.14 cfs @ 22.26 hrs HW=6.00' (Free Discharge) 1=Infiltration Model (Custom Controls 0.14 cfs) Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 10HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0 0 0 Inflow Area=22,357 sf Peak Elev=6.00' Storage=0 cf 0.00 cfs 0.00 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.170.160.150.140.130.120.110.10.090.080.070.060.050.040.030.020.010Elevation (feet)6.5 6.48 6.46 6.44 6.42 6.4 6.38 6.36 6.34 6.32 6.3 6.28 6.26 6.24 6.22 6.2 6.18 6.16 6.14 6.12 6.1 6.08 6.06 6.04 6.02 6 Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 11HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 1,1001,0009008007006005004003002001000Elevation (feet)6.5 6.48 6.46 6.44 6.42 6.4 6.38 6.36 6.34 6.32 6.3 6.28 6.26 6.24 6.22 6.2 6.18 6.16 6.14 6.12 6.1 6.08 6.06 6.04 6.02 6 Infiltration System Storage Model Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 12HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=22,357 sf 12.86% Impervious Runoff Depth>0.22"Subcatchment 1S: Drainage Area DA3 Tc=5.0 min CN=40 Runoff=0.03 cfs 417 cf Peak Elev=6.00' Storage=2 cf Inflow=0.03 cfs 417 cfPond 1P: Low area drainage catchment Outflow=0.03 cfs 416 cf Total Runoff Area = 22,357 sf Runoff Volume = 417 cf Average Runoff Depth = 0.22" 87.14% Pervious = 19,482 sf 12.86% Impervious = 2,875 sf Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 13HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA3 PROP Time of Concentration Runoff = 0.03 cfs @ 12.43 hrs, Volume= 417 cf, Depth> 0.22" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 10 Yr Rainfall=4.95" Area (sf) CN Description 19,482 32 Woods/grass comb., Good, HSG A * 2,875 98 Patio area * 0 55 Pervious gravel driveway 22,357 40 Weighted Average 19,482 87.14% Pervious Area 2,875 12.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA3 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Type III 24-hr Barn Cty 10 Yr Rainfall=4.95" Runoff Area=22,357 sf Runoff Volume=417 cf Runoff Depth>0.22" Tc=5.0 min CN=40 0.03 cfs Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 14HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 22,357 sf, 12.86% Impervious, Inflow Depth > 0.22" for Barn Cty 10 Yr event Inflow = 0.03 cfs @ 12.43 hrs, Volume= 417 cf Outflow = 0.03 cfs @ 12.45 hrs, Volume= 416 cf, Atten= 1%, Lag= 1.4 min Primary = 0.03 cfs @ 12.45 hrs, Volume= 416 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 6.00' @ 12.45 hrs Storage= 2 cf Plug-Flow detention time= 1.3 min calculated for 416 cf (100% of inflow) Center-of-Mass det. time= 0.9 min ( 998.3 - 997.4 ) Volume Invert Avail.Storage Storage Description #1 6.00' 1,122 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 6.00 0 6.50 1,122 Device Routing Invert Outlet Devices #1 Primary 5.90'Infiltration Model Elev. (feet) 5.90 6.00 6.50 Disch. (cfs) 0.000 0.140 0.173 Primary OutFlow Max=0.14 cfs @ 12.45 hrs HW=6.00' (Free Discharge) 1=Infiltration Model (Custom Controls 0.14 cfs) Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 15HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Inflow Area=22,357 sf Peak Elev=6.00' Storage=2 cf 0.03 cfs 0.03 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.170.160.150.140.130.120.110.10.090.080.070.060.050.040.030.020.010Elevation (feet)6.5 6.48 6.46 6.44 6.42 6.4 6.38 6.36 6.34 6.32 6.3 6.28 6.26 6.24 6.22 6.2 6.18 6.16 6.14 6.12 6.1 6.08 6.06 6.04 6.02 6 Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 16HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 1,1001,0009008007006005004003002001000Elevation (feet)6.5 6.48 6.46 6.44 6.42 6.4 6.38 6.36 6.34 6.32 6.3 6.28 6.26 6.24 6.22 6.2 6.18 6.16 6.14 6.12 6.1 6.08 6.06 6.04 6.02 6 Infiltration System Storage Model Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 17HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=22,357 sf 12.86% Impervious Runoff Depth>0.47"Subcatchment 1S: Drainage Area DA3 Tc=5.0 min CN=40 Runoff=0.10 cfs 884 cf Peak Elev=6.00' Storage=8 cf Inflow=0.10 cfs 884 cfPond 1P: Low area drainage catchment Outflow=0.10 cfs 884 cf Total Runoff Area = 22,357 sf Runoff Volume = 884 cf Average Runoff Depth = 0.47" 87.14% Pervious = 19,482 sf 12.86% Impervious = 2,875 sf Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 18HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA3 PROP Time of Concentration Runoff = 0.10 cfs @ 12.31 hrs, Volume= 884 cf, Depth> 0.47" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 25 Yr Rainfall=5.92" Area (sf) CN Description 19,482 32 Woods/grass comb., Good, HSG A * 2,875 98 Patio area * 0 55 Pervious gravel driveway 22,357 40 Weighted Average 19,482 87.14% Pervious Area 2,875 12.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA3 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr Barn Cty 25 Yr Rainfall=5.92" Runoff Area=22,357 sf Runoff Volume=884 cf Runoff Depth>0.47" Tc=5.0 min CN=40 0.10 cfs Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 19HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 22,357 sf, 12.86% Impervious, Inflow Depth > 0.47" for Barn Cty 25 Yr event Inflow = 0.10 cfs @ 12.31 hrs, Volume= 884 cf Outflow = 0.10 cfs @ 12.33 hrs, Volume= 884 cf, Atten= 0%, Lag= 1.3 min Primary = 0.10 cfs @ 12.33 hrs, Volume= 884 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 6.00' @ 12.33 hrs Storage= 8 cf Plug-Flow detention time= 1.3 min calculated for 884 cf (100% of inflow) Center-of-Mass det. time= 1.0 min ( 952.4 - 951.4 ) Volume Invert Avail.Storage Storage Description #1 6.00' 1,122 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 6.00 0 6.50 1,122 Device Routing Invert Outlet Devices #1 Primary 5.90'Infiltration Model Elev. (feet) 5.90 6.00 6.50 Disch. (cfs) 0.000 0.140 0.173 Primary OutFlow Max=0.14 cfs @ 12.33 hrs HW=6.00' (Free Discharge) 1=Infiltration Model (Custom Controls 0.14 cfs) Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 20HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=22,357 sf Peak Elev=6.00' Storage=8 cf 0.10 cfs 0.10 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.170.160.150.140.130.120.110.10.090.080.070.060.050.040.030.020.010Elevation (feet)6.5 6.48 6.46 6.44 6.42 6.4 6.38 6.36 6.34 6.32 6.3 6.28 6.26 6.24 6.22 6.2 6.18 6.16 6.14 6.12 6.1 6.08 6.06 6.04 6.02 6 Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 21HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 1,1001,0009008007006005004003002001000Elevation (feet)6.5 6.48 6.46 6.44 6.42 6.4 6.38 6.36 6.34 6.32 6.3 6.28 6.26 6.24 6.22 6.2 6.18 6.16 6.14 6.12 6.1 6.08 6.06 6.04 6.02 6 Infiltration System Storage Model Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 22HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=22,357 sf 12.86% Impervious Runoff Depth>0.71"Subcatchment 1S: Drainage Area DA3 Tc=5.0 min CN=40 Runoff=0.21 cfs 1,328 cf Peak Elev=6.03' Storage=60 cf Inflow=0.21 cfs 1,328 cfPond 1P: Low area drainage catchment Outflow=0.14 cfs 1,327 cf Total Runoff Area = 22,357 sf Runoff Volume = 1,328 cf Average Runoff Depth = 0.71" 87.14% Pervious = 19,482 sf 12.86% Impervious = 2,875 sf Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 23HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA3 PROP Time of Concentration Runoff = 0.21 cfs @ 12.13 hrs, Volume= 1,328 cf, Depth> 0.71" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 50 yr. Rainfall=6.65" Area (sf) CN Description 19,482 32 Woods/grass comb., Good, HSG A * 2,875 98 Patio area * 0 55 Pervious gravel driveway 22,357 40 Weighted Average 19,482 87.14% Pervious Area 2,875 12.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA3 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type III 24-hr Barn Cty 50 yr. Rainfall=6.65" Runoff Area=22,357 sf Runoff Volume=1,328 cf Runoff Depth>0.71" Tc=5.0 min CN=40 0.21 cfs Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 24HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 22,357 sf, 12.86% Impervious, Inflow Depth > 0.71" for Barn Cty 50 yr. event Inflow = 0.21 cfs @ 12.13 hrs, Volume= 1,328 cf Outflow = 0.14 cfs @ 12.44 hrs, Volume= 1,327 cf, Atten= 32%, Lag= 18.9 min Primary = 0.14 cfs @ 12.44 hrs, Volume= 1,327 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 6.03' @ 12.44 hrs Storage= 60 cf Plug-Flow detention time= 2.2 min calculated for 1,327 cf (100% of inflow) Center-of-Mass det. time= 1.9 min ( 932.2 - 930.3 ) Volume Invert Avail.Storage Storage Description #1 6.00' 1,122 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 6.00 0 6.50 1,122 Device Routing Invert Outlet Devices #1 Primary 5.90'Infiltration Model Elev. (feet) 5.90 6.00 6.50 Disch. (cfs) 0.000 0.140 0.173 Primary OutFlow Max=0.14 cfs @ 12.44 hrs HW=6.03' (Free Discharge) 1=Infiltration Model (Custom Controls 0.14 cfs) Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 25HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=22,357 sf Peak Elev=6.03' Storage=60 cf 0.21 cfs 0.14 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.170.160.150.140.130.120.110.10.090.080.070.060.050.040.030.020.010Elevation (feet)6.5 6.48 6.46 6.44 6.42 6.4 6.38 6.36 6.34 6.32 6.3 6.28 6.26 6.24 6.22 6.2 6.18 6.16 6.14 6.12 6.1 6.08 6.06 6.04 6.02 6 Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 26HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 1,1001,0009008007006005004003002001000Elevation (feet)6.5 6.48 6.46 6.44 6.42 6.4 6.38 6.36 6.34 6.32 6.3 6.28 6.26 6.24 6.22 6.2 6.18 6.16 6.14 6.12 6.1 6.08 6.06 6.04 6.02 6 Infiltration System Storage Model Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 27HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=22,357 sf 12.86% Impervious Runoff Depth>1.16"Subcatchment 1S: Drainage Area DA3 Tc=5.0 min CN=40 Runoff=0.49 cfs 2,164 cf Peak Elev=6.15' Storage=337 cf Inflow=0.49 cfs 2,164 cfPond 1P: Low area drainage catchment Outflow=0.15 cfs 2,163 cf Total Runoff Area = 22,357 sf Runoff Volume = 2,164 cf Average Runoff Depth = 1.16" 87.14% Pervious = 19,482 sf 12.86% Impervious = 2,875 sf Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 28HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA3 PROP Time of Concentration Runoff = 0.49 cfs @ 12.10 hrs, Volume= 2,164 cf, Depth> 1.16" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 100 yr Rainfall=7.80" Area (sf) CN Description 19,482 32 Woods/grass comb., Good, HSG A * 2,875 98 Patio area * 0 55 Pervious gravel driveway 22,357 40 Weighted Average 19,482 87.14% Pervious Area 2,875 12.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA3 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr Barn Cty 100 yr Rainfall=7.80" Runoff Area=22,357 sf Runoff Volume=2,164 cf Runoff Depth>1.16" Tc=5.0 min CN=40 0.49 cfs Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 29HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 22,357 sf, 12.86% Impervious, Inflow Depth > 1.16" for Barn Cty 100 yr event Inflow = 0.49 cfs @ 12.10 hrs, Volume= 2,164 cf Outflow = 0.15 cfs @ 12.55 hrs, Volume= 2,163 cf, Atten= 69%, Lag= 27.0 min Primary = 0.15 cfs @ 12.55 hrs, Volume= 2,163 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 6.15' @ 12.55 hrs Storage= 337 cf Plug-Flow detention time= 12.5 min calculated for 2,163 cf (100% of inflow) Center-of-Mass det. time= 12.2 min ( 920.3 - 908.1 ) Volume Invert Avail.Storage Storage Description #1 6.00' 1,122 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 6.00 0 6.50 1,122 Device Routing Invert Outlet Devices #1 Primary 5.90'Infiltration Model Elev. (feet) 5.90 6.00 6.50 Disch. (cfs) 0.000 0.140 0.173 Primary OutFlow Max=0.15 cfs @ 12.55 hrs HW=6.15' (Free Discharge) 1=Infiltration Model (Custom Controls 0.15 cfs) Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 30HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=22,357 sf Peak Elev=6.15' Storage=337 cf 0.49 cfs 0.15 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.170.160.150.140.130.120.110.10.090.080.070.060.050.040.030.020.010Elevation (feet)6.5 6.48 6.46 6.44 6.42 6.4 6.38 6.36 6.34 6.32 6.3 6.28 6.26 6.24 6.22 6.2 6.18 6.16 6.14 6.12 6.1 6.08 6.06 6.04 6.02 6 Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc Page 31HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 1,1001,0009008007006005004003002001000Elevation (feet)6.5 6.48 6.46 6.44 6.42 6.4 6.38 6.36 6.34 6.32 6.3 6.28 6.26 6.24 6.22 6.2 6.18 6.16 6.14 6.12 6.1 6.08 6.06 6.04 6.02 6 Infiltration System Storage Model Revised proposed conditions DA P3 FrontC:\Users\Public\Documents\HydroCAD\Projects\ Table of Contents150 SOUTH ST PROP DA P3 rev Prepared by Down Cape Engineering Inc HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (all nodes) 4 Soil Listing (all nodes) 5 Ground Covers (all nodes) 6 Notes Listing (all nodes) Barn Cty 2 Yr Event 7 Node Listing 8 Subcat 1S: Drainage Area DA3 PROP 9 Pond 1P: Low area drainage catchment Barn Cty 10 Yr Event 12 Node Listing 13 Subcat 1S: Drainage Area DA3 PROP 14 Pond 1P: Low area drainage catchment Barn Cty 25 Yr Event 17 Node Listing 18 Subcat 1S: Drainage Area DA3 PROP 19 Pond 1P: Low area drainage catchment Barn Cty 50 yr. Event 22 Node Listing 23 Subcat 1S: Drainage Area DA3 PROP 24 Pond 1P: Low area drainage catchment Barn Cty 100 yr Event 27 Node Listing 28 Subcat 1S: Drainage Area DA3 PROP 29 Pond 1P: Low area drainage catchment 1S Drainage Area DA4 PROP 1P Low area drainage catchment Routing Diagram for 150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 2HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 Barn Cty 2 Yr Type III 24-hr Default 24.00 1 3.39 2 2 Barn Cty 10 Yr Type III 24-hr Default 24.00 1 4.95 2 3 Barn Cty 25 Yr Type III 24-hr Default 24.00 1 5.92 2 4 Barn Cty 50 yr. Type III 24-hr Default 24.00 1 6.65 2 5 Barn Cty 100 yr Type III 24-hr Default 24.00 1 7.80 2 Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 3HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (sq-ft) CN Description (subcatchment-numbers) 6,653 49 50-75% Grass cover, Fair, HSG A (1S) 6,653 49 TOTAL AREA Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 4HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (sq-ft) Soil Group Subcatchment Numbers 6,653 HSG A 1S 0 HSG B 0 HSG C 0 HSG D 0 Other 6,653 TOTAL AREA Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 5HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (sq-ft) HSG-B (sq-ft) HSG-C (sq-ft) HSG-D (sq-ft) Other (sq-ft) Total (sq-ft) Ground Cover Subcatchment Numbers 6,653 0 0 0 0 6,653 50-75% Grass cover, Fair 6,653 0 0 0 0 6,653 TOTAL AREA Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 6HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Notes Listing (all nodes) Line# Node Number Notes 1 1S Time of Concentration 2 1P Low drainage area 3"/hr infiltration rate model Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 7HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=6,653 sf 0.00% Impervious Runoff Depth>0.15"Subcatchment 1S: Drainage Area DA4 PROP Tc=5.0 min CN=49 Runoff=0.00 cfs 81 cf Peak Elev=5.00' Storage=1 cf Inflow=0.00 cfs 81 cfPond 1P: Low area drainage catchment Outflow=0.00 cfs 80 cf Total Runoff Area = 6,653 sf Runoff Volume = 81 cf Average Runoff Depth = 0.15" 100.00% Pervious = 6,653 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 8HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA4 PROP Time of Concentration Runoff = 0.00 cfs @ 12.44 hrs, Volume= 81 cf, Depth> 0.15" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 2 Yr Rainfall=3.39" Area (sf) CN Description 6,653 49 50-75% Grass cover, Fair, HSG A * 0 98 Patio area * 0 55 Pervious gravel driveway 6,653 49 Weighted Average 6,653 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA4 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.005 0.005 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0 Type III 24-hr Barn Cty 2 Yr Rainfall=3.39" Runoff Area=6,653 sf Runoff Volume=81 cf Runoff Depth>0.15" Tc=5.0 min CN=49 0.00 cfs Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 9HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 6,653 sf, 0.00% Impervious, Inflow Depth > 0.15" for Barn Cty 2 Yr event Inflow = 0.00 cfs @ 12.44 hrs, Volume= 81 cf Outflow = 0.00 cfs @ 12.52 hrs, Volume= 80 cf, Atten= 11%, Lag= 4.5 min Primary = 0.00 cfs @ 12.52 hrs, Volume= 80 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 5.00' @ 12.52 hrs Storage= 1 cf Plug-Flow detention time= 4.7 min calculated for 80 cf (100% of inflow) Center-of-Mass det. time= 3.2 min ( 1,004.9 - 1,001.7 ) Volume Invert Avail.Storage Storage Description #1 5.00' 567 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 5.00 0 5.50 567 Device Routing Invert Outlet Devices #1 Primary 4.90'Infiltration Model Elev. (feet) 4.90 5.00 6.50 Disch. (cfs) 0.000 0.060 0.100 Primary OutFlow Max=0.06 cfs @ 12.52 hrs HW=5.00' (Free Discharge) 1=Infiltration Model (Custom Controls 0.06 cfs) Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 10HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.005 0.005 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0 Inflow Area=6,653 sf Peak Elev=5.00' Storage=1 cf 0.00 cfs 0.00 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.10.0950.090.0850.080.0750.070.0650.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050Elevation (feet)6 5 Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 11HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 560540520500480460440420400380360340320300280260240220200180160140120100806040200Elevation (feet)6 5 Infiltration System Storage Model Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 12HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=6,653 sf 0.00% Impervious Runoff Depth>0.62"Subcatchment 1S: Drainage Area DA4 PROP Tc=5.0 min CN=49 Runoff=0.07 cfs 343 cf Peak Elev=5.01' Storage=14 cf Inflow=0.07 cfs 343 cfPond 1P: Low area drainage catchment Outflow=0.05 cfs 342 cf Total Runoff Area = 6,653 sf Runoff Volume = 343 cf Average Runoff Depth = 0.62" 100.00% Pervious = 6,653 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 13HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA4 PROP Time of Concentration Runoff = 0.07 cfs @ 12.11 hrs, Volume= 343 cf, Depth> 0.62" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 10 Yr Rainfall=4.95" Area (sf) CN Description 6,653 49 50-75% Grass cover, Fair, HSG A * 0 98 Patio area * 0 55 Pervious gravel driveway 6,653 49 Weighted Average 6,653 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA4 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr Barn Cty 10 Yr Rainfall=4.95" Runoff Area=6,653 sf Runoff Volume=343 cf Runoff Depth>0.62" Tc=5.0 min CN=49 0.07 cfs Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 14HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 6,653 sf, 0.00% Impervious, Inflow Depth > 0.62" for Barn Cty 10 Yr event Inflow = 0.07 cfs @ 12.11 hrs, Volume= 343 cf Outflow = 0.05 cfs @ 12.23 hrs, Volume= 342 cf, Atten= 21%, Lag= 7.0 min Primary = 0.05 cfs @ 12.23 hrs, Volume= 342 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 5.01' @ 12.23 hrs Storage= 14 cf Plug-Flow detention time= 4.7 min calculated for 342 cf (100% of inflow) Center-of-Mass det. time= 3.6 min ( 923.4 - 919.7 ) Volume Invert Avail.Storage Storage Description #1 5.00' 567 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 5.00 0 5.50 567 Device Routing Invert Outlet Devices #1 Primary 4.90'Infiltration Model Elev. (feet) 4.90 5.00 6.50 Disch. (cfs) 0.000 0.060 0.100 Primary OutFlow Max=0.06 cfs @ 12.23 hrs HW=5.01' (Free Discharge) 1=Infiltration Model (Custom Controls 0.06 cfs) Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 15HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=6,653 sf Peak Elev=5.01' Storage=14 cf 0.07 cfs 0.05 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.10.0950.090.0850.080.0750.070.0650.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050Elevation (feet)6 5 Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 16HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 560540520500480460440420400380360340320300280260240220200180160140120100806040200Elevation (feet)6 5 Infiltration System Storage Model Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 17HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=6,653 sf 0.00% Impervious Runoff Depth>1.03"Subcatchment 1S: Drainage Area DA4 PROP Tc=5.0 min CN=49 Runoff=0.14 cfs 572 cf Peak Elev=5.06' Storage=69 cf Inflow=0.14 cfs 572 cfPond 1P: Low area drainage catchment Outflow=0.06 cfs 571 cf Total Runoff Area = 6,653 sf Runoff Volume = 572 cf Average Runoff Depth = 1.03" 100.00% Pervious = 6,653 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 18HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA4 PROP Time of Concentration Runoff = 0.14 cfs @ 12.10 hrs, Volume= 572 cf, Depth> 1.03" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 25 Yr Rainfall=5.92" Area (sf) CN Description 6,653 49 50-75% Grass cover, Fair, HSG A * 0 98 Patio area * 0 55 Pervious gravel driveway 6,653 49 Weighted Average 6,653 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA4 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type III 24-hr Barn Cty 25 Yr Rainfall=5.92" Runoff Area=6,653 sf Runoff Volume=572 cf Runoff Depth>1.03" Tc=5.0 min CN=49 0.14 cfs Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 19HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 6,653 sf, 0.00% Impervious, Inflow Depth > 1.03" for Barn Cty 25 Yr event Inflow = 0.14 cfs @ 12.10 hrs, Volume= 572 cf Outflow = 0.06 cfs @ 12.45 hrs, Volume= 571 cf, Atten= 57%, Lag= 21.0 min Primary = 0.06 cfs @ 12.45 hrs, Volume= 571 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 5.06' @ 12.45 hrs Storage= 69 cf Plug-Flow detention time= 7.8 min calculated for 571 cf (100% of inflow) Center-of-Mass det. time= 6.8 min ( 904.8 - 898.0 ) Volume Invert Avail.Storage Storage Description #1 5.00' 567 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 5.00 0 5.50 567 Device Routing Invert Outlet Devices #1 Primary 4.90'Infiltration Model Elev. (feet) 4.90 5.00 6.50 Disch. (cfs) 0.000 0.060 0.100 Primary OutFlow Max=0.06 cfs @ 12.45 hrs HW=5.06' (Free Discharge) 1=Infiltration Model (Custom Controls 0.06 cfs) Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 20HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=6,653 sf Peak Elev=5.06' Storage=69 cf 0.14 cfs 0.06 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.10.0950.090.0850.080.0750.070.0650.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050Elevation (feet)6 5 Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 21HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 560540520500480460440420400380360340320300280260240220200180160140120100806040200Elevation (feet)6 5 Infiltration System Storage Model Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 22HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=6,653 sf 0.00% Impervious Runoff Depth>1.39"Subcatchment 1S: Drainage Area DA4 PROP Tc=5.0 min CN=49 Runoff=0.21 cfs 771 cf Peak Elev=5.12' Storage=140 cf Inflow=0.21 cfs 771 cfPond 1P: Low area drainage catchment Outflow=0.06 cfs 770 cf Total Runoff Area = 6,653 sf Runoff Volume = 771 cf Average Runoff Depth = 1.39" 100.00% Pervious = 6,653 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 23HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA4 PROP Time of Concentration Runoff = 0.21 cfs @ 12.09 hrs, Volume= 771 cf, Depth> 1.39" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 50 yr. Rainfall=6.65" Area (sf) CN Description 6,653 49 50-75% Grass cover, Fair, HSG A * 0 98 Patio area * 0 55 Pervious gravel driveway 6,653 49 Weighted Average 6,653 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA4 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type III 24-hr Barn Cty 50 yr. Rainfall=6.65" Runoff Area=6,653 sf Runoff Volume=771 cf Runoff Depth>1.39" Tc=5.0 min CN=49 0.21 cfs Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 24HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 6,653 sf, 0.00% Impervious, Inflow Depth > 1.39" for Barn Cty 50 yr. event Inflow = 0.21 cfs @ 12.09 hrs, Volume= 771 cf Outflow = 0.06 cfs @ 12.51 hrs, Volume= 770 cf, Atten= 70%, Lag= 25.3 min Primary = 0.06 cfs @ 12.51 hrs, Volume= 770 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 5.12' @ 12.51 hrs Storage= 140 cf Plug-Flow detention time= 14.1 min calculated for 770 cf (100% of inflow) Center-of-Mass det. time= 13.2 min ( 900.0 - 886.8 ) Volume Invert Avail.Storage Storage Description #1 5.00' 567 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 5.00 0 5.50 567 Device Routing Invert Outlet Devices #1 Primary 4.90'Infiltration Model Elev. (feet) 4.90 5.00 6.50 Disch. (cfs) 0.000 0.060 0.100 Primary OutFlow Max=0.06 cfs @ 12.51 hrs HW=5.12' (Free Discharge) 1=Infiltration Model (Custom Controls 0.06 cfs) Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 25HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=6,653 sf Peak Elev=5.12' Storage=140 cf 0.21 cfs 0.06 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.10.0950.090.0850.080.0750.070.0650.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050Elevation (feet)6 5 Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 26HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 560540520500480460440420400380360340320300280260240220200180160140120100806040200Elevation (feet)6 5 Infiltration System Storage Model Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 27HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=6,653 sf 0.00% Impervious Runoff Depth>2.02"Subcatchment 1S: Drainage Area DA4 PROP Tc=5.0 min CN=49 Runoff=0.34 cfs 1,123 cf Peak Elev=5.25' Storage=280 cf Inflow=0.34 cfs 1,123 cfPond 1P: Low area drainage catchment Outflow=0.07 cfs 1,121 cf Total Runoff Area = 6,653 sf Runoff Volume = 1,123 cf Average Runoff Depth = 2.02" 100.00% Pervious = 6,653 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 28HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA4 PROP Time of Concentration Runoff = 0.34 cfs @ 12.09 hrs, Volume= 1,123 cf, Depth> 2.02" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 100 yr Rainfall=7.80" Area (sf) CN Description 6,653 49 50-75% Grass cover, Fair, HSG A * 0 98 Patio area * 0 55 Pervious gravel driveway 6,653 49 Weighted Average 6,653 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA4 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr Barn Cty 100 yr Rainfall=7.80" Runoff Area=6,653 sf Runoff Volume=1,123 cf Runoff Depth>2.02" Tc=5.0 min CN=49 0.34 cfs Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 29HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 6,653 sf, 0.00% Impervious, Inflow Depth > 2.02" for Barn Cty 100 yr event Inflow = 0.34 cfs @ 12.09 hrs, Volume= 1,123 cf Outflow = 0.07 cfs @ 12.58 hrs, Volume= 1,121 cf, Atten= 80%, Lag= 29.7 min Primary = 0.07 cfs @ 12.58 hrs, Volume= 1,121 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 5.25' @ 12.58 hrs Storage= 280 cf Plug-Flow detention time= 30.5 min calculated for 1,121 cf (100% of inflow) Center-of-Mass det. time= 29.7 min ( 903.4 - 873.7 ) Volume Invert Avail.Storage Storage Description #1 5.00' 567 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 5.00 0 5.50 567 Device Routing Invert Outlet Devices #1 Primary 4.90'Infiltration Model Elev. (feet) 4.90 5.00 6.50 Disch. (cfs) 0.000 0.060 0.100 Primary OutFlow Max=0.07 cfs @ 12.58 hrs HW=5.25' (Free Discharge) 1=Infiltration Model (Custom Controls 0.07 cfs) Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 30HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=6,653 sf Peak Elev=5.25' Storage=280 cf 0.34 cfs 0.07 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.10.0950.090.0850.080.0750.070.0650.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050Elevation (feet)6 5 Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc Page 31HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 560540520500480460440420400380360340320300280260240220200180160140120100806040200Elevation (feet)6 5 Infiltration System Storage Model Revised proposed conditions DA P4C:\Users\Public\Documents\HydroCAD\Projects\ Table of Contents150 SOUTH ST PROP DA P4 rev Prepared by Down Cape Engineering Inc HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (all nodes) 4 Soil Listing (all nodes) 5 Ground Covers (all nodes) 6 Notes Listing (all nodes) Barn Cty 2 Yr Event 7 Node Listing 8 Subcat 1S: Drainage Area DA4 PROP 9 Pond 1P: Low area drainage catchment Barn Cty 10 Yr Event 12 Node Listing 13 Subcat 1S: Drainage Area DA4 PROP 14 Pond 1P: Low area drainage catchment Barn Cty 25 Yr Event 17 Node Listing 18 Subcat 1S: Drainage Area DA4 PROP 19 Pond 1P: Low area drainage catchment Barn Cty 50 yr. Event 22 Node Listing 23 Subcat 1S: Drainage Area DA4 PROP 24 Pond 1P: Low area drainage catchment Barn Cty 100 yr Event 27 Node Listing 28 Subcat 1S: Drainage Area DA4 PROP 29 Pond 1P: Low area drainage catchment 1S Drainage Area DA5 PROP 1P Low area drainage catchment Routing Diagram for 150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 2HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 Barn Cty 2 Yr Type III 24-hr Default 24.00 1 3.39 2 2 Barn Cty 10 Yr Type III 24-hr Default 24.00 1 4.95 2 3 Barn Cty 25 Yr Type III 24-hr Default 24.00 1 5.92 2 4 Barn Cty 50 yr. Type III 24-hr Default 24.00 1 6.65 2 5 Barn Cty 100 yr Type III 24-hr Default 24.00 1 7.80 2 Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 3HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (sq-ft) CN Description (subcatchment-numbers) 11,171 39 >75% Grass cover, Good, HSG A (1S) 11,171 39 TOTAL AREA Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 4HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (sq-ft) Soil Group Subcatchment Numbers 11,171 HSG A 1S 0 HSG B 0 HSG C 0 HSG D 0 Other 11,171 TOTAL AREA Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 5HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (sq-ft) HSG-B (sq-ft) HSG-C (sq-ft) HSG-D (sq-ft) Other (sq-ft) Total (sq-ft) Ground Cover Subcatchment Numbers 11,171 0 0 0 0 11,171 >75% Grass cover, Good 11,171 0 0 0 0 11,171 TOTAL AREA Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 6HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Notes Listing (all nodes) Line# Node Number Notes 1 1S Time of Concentration 2 1P Low drainage area 3"/hr infiltration rate model Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 7HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=11,171 sf 0.00% Impervious Runoff Depth>0.00"Subcatchment 1S: Drainage Area DA5 PROP Tc=5.0 min CN=39 Runoff=0.00 cfs 4 cf Peak Elev=4.52' Storage=4 cf Inflow=0.00 cfs 4 cfPond 1P: Low area drainage catchment Outflow=0.00 cfs 0 cf Total Runoff Area = 11,171 sf Runoff Volume = 4 cf Average Runoff Depth = 0.00" 100.00% Pervious = 11,171 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 8HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA5 PROP Time of Concentration Runoff = 0.00 cfs @ 23.55 hrs, Volume= 4 cf, Depth> 0.00" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 2 Yr Rainfall=3.39" Area (sf) CN Description 11,171 39 >75% Grass cover, Good, HSG A * 0 98 Patio area * 0 55 Pervious gravel driveway 11,171 39 Weighted Average 11,171 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA5 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0 0 0 0 0 Type III 24-hr Barn Cty 2 Yr Rainfall=3.39" Runoff Area=11,171 sf Runoff Volume=4 cf Runoff Depth>0.00" Tc=5.0 min CN=39 0.00 cfs Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 9HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 11,171 sf, 0.00% Impervious, Inflow Depth > 0.00" for Barn Cty 2 Yr event Inflow = 0.00 cfs @ 23.55 hrs, Volume= 4 cf Outflow = 0.00 cfs @ 1.00 hrs, Volume= 0 cf, Atten= 100%, Lag= 0.0 min Primary = 0.00 cfs @ 1.00 hrs, Volume= 0 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.52' @ 24.00 hrs Storage= 4 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 4.50' 130 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.50 0 5.00 115 5.50 130 Device Routing Invert Outlet Devices #1 Primary 4.90'Infiltration Model Elev. (feet) 4.90 5.10 5.50 Disch. (cfs) 0.000 0.300 0.310 Primary OutFlow Max=0.00 cfs @ 1.00 hrs HW=4.50' (Free Discharge) 1=Infiltration Model ( Controls 0.00 cfs) Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 10HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0 0 0 0 0 Inflow Area=11,171 sf Peak Elev=4.52' Storage=4 cf 0.00 cfs 0.00 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 Infiltration Model Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 11HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 13012512011511010510095908580757065605550454035302520151050Elevation (feet)5 Infiltration System Storage Model Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 12HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=11,171 sf 0.00% Impervious Runoff Depth>0.19"Subcatchment 1S: Drainage Area DA5 PROP Tc=5.0 min CN=39 Runoff=0.01 cfs 176 cf Peak Elev=4.90' Storage=93 cf Inflow=0.01 cfs 176 cfPond 1P: Low area drainage catchment Outflow=0.00 cfs 84 cf Total Runoff Area = 11,171 sf Runoff Volume = 176 cf Average Runoff Depth = 0.19" 100.00% Pervious = 11,171 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 13HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA5 PROP Time of Concentration Runoff = 0.01 cfs @ 12.47 hrs, Volume= 176 cf, Depth> 0.19" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 10 Yr Rainfall=4.95" Area (sf) CN Description 11,171 39 >75% Grass cover, Good, HSG A * 0 98 Patio area * 0 55 Pervious gravel driveway 11,171 39 Weighted Average 11,171 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA5 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.009 0.009 0.008 0.008 0.007 0.007 0.006 0.006 0.005 0.005 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0.000 0 Type III 24-hr Barn Cty 10 Yr Rainfall=4.95" Runoff Area=11,171 sf Runoff Volume=176 cf Runoff Depth>0.19" Tc=5.0 min CN=39 0.01 cfs Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 14HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 11,171 sf, 0.00% Impervious, Inflow Depth > 0.19" for Barn Cty 10 Yr event Inflow = 0.01 cfs @ 12.47 hrs, Volume= 176 cf Outflow = 0.00 cfs @ 16.59 hrs, Volume= 84 cf, Atten= 47%, Lag= 247.1 min Primary = 0.00 cfs @ 16.59 hrs, Volume= 84 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.90' @ 16.59 hrs Storage= 93 cf Plug-Flow detention time= 345.5 min calculated for 84 cf (48% of inflow) Center-of-Mass det. time= 175.3 min ( 1,186.9 - 1,011.6 ) Volume Invert Avail.Storage Storage Description #1 4.50' 130 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.50 0 5.00 115 5.50 130 Device Routing Invert Outlet Devices #1 Primary 4.90'Infiltration Model Elev. (feet) 4.90 5.10 5.50 Disch. (cfs) 0.000 0.300 0.310 Primary OutFlow Max=0.00 cfs @ 16.59 hrs HW=4.90' (Free Discharge) 1=Infiltration Model (Custom Controls 0.00 cfs) Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 15HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.009 0.009 0.008 0.008 0.007 0.007 0.006 0.006 0.005 0.005 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0.000 0 Inflow Area=11,171 sf Peak Elev=4.90' Storage=93 cf 0.01 cfs 0.00 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 Infiltration Model Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 16HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 13012512011511010510095908580757065605550454035302520151050Elevation (feet)5 Infiltration System Storage Model Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 17HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=11,171 sf 0.00% Impervious Runoff Depth>0.42"Subcatchment 1S: Drainage Area DA5 PROP Tc=5.0 min CN=39 Runoff=0.04 cfs 393 cf Peak Elev=4.91' Storage=95 cf Inflow=0.04 cfs 393 cfPond 1P: Low area drainage catchment Outflow=0.02 cfs 300 cf Total Runoff Area = 11,171 sf Runoff Volume = 393 cf Average Runoff Depth = 0.42" 100.00% Pervious = 11,171 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 18HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA5 PROP Time of Concentration Runoff = 0.04 cfs @ 12.34 hrs, Volume= 393 cf, Depth> 0.42" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 25 Yr Rainfall=5.92" Area (sf) CN Description 11,171 39 >75% Grass cover, Good, HSG A * 0 98 Patio area * 0 55 Pervious gravel driveway 11,171 39 Weighted Average 11,171 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA5 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.046 0.044 0.042 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Type III 24-hr Barn Cty 25 Yr Rainfall=5.92" Runoff Area=11,171 sf Runoff Volume=393 cf Runoff Depth>0.42" Tc=5.0 min CN=39 0.04 cfs Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 19HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 11,171 sf, 0.00% Impervious, Inflow Depth > 0.42" for Barn Cty 25 Yr event Inflow = 0.04 cfs @ 12.34 hrs, Volume= 393 cf Outflow = 0.02 cfs @ 13.27 hrs, Volume= 300 cf, Atten= 61%, Lag= 56.3 min Primary = 0.02 cfs @ 13.27 hrs, Volume= 300 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.91' @ 13.27 hrs Storage= 95 cf Plug-Flow detention time= 160.1 min calculated for 300 cf (76% of inflow) Center-of-Mass det. time= 66.0 min ( 1,026.5 - 960.5 ) Volume Invert Avail.Storage Storage Description #1 4.50' 130 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.50 0 5.00 115 5.50 130 Device Routing Invert Outlet Devices #1 Primary 4.90'Infiltration Model Elev. (feet) 4.90 5.10 5.50 Disch. (cfs) 0.000 0.300 0.310 Primary OutFlow Max=0.02 cfs @ 13.27 hrs HW=4.91' (Free Discharge) 1=Infiltration Model (Custom Controls 0.02 cfs) Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 20HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.046 0.044 0.042 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Inflow Area=11,171 sf Peak Elev=4.91' Storage=95 cf 0.04 cfs 0.02 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 Infiltration Model Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 21HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 13012512011511010510095908580757065605550454035302520151050Elevation (feet)5 Infiltration System Storage Model Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 22HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=11,171 sf 0.00% Impervious Runoff Depth>0.65"Subcatchment 1S: Drainage Area DA5 PROP Tc=5.0 min CN=39 Runoff=0.08 cfs 601 cf Peak Elev=4.94' Storage=100 cf Inflow=0.08 cfs 601 cfPond 1P: Low area drainage catchment Outflow=0.05 cfs 509 cf Total Runoff Area = 11,171 sf Runoff Volume = 601 cf Average Runoff Depth = 0.65" 100.00% Pervious = 11,171 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 23HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA5 PROP Time of Concentration Runoff = 0.08 cfs @ 12.14 hrs, Volume= 601 cf, Depth> 0.65" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 50 yr. Rainfall=6.65" Area (sf) CN Description 11,171 39 >75% Grass cover, Good, HSG A * 0 98 Patio area * 0 55 Pervious gravel driveway 11,171 39 Weighted Average 11,171 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA5 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr Barn Cty 50 yr. Rainfall=6.65" Runoff Area=11,171 sf Runoff Volume=601 cf Runoff Depth>0.65" Tc=5.0 min CN=39 0.08 cfs Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 24HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 11,171 sf, 0.00% Impervious, Inflow Depth > 0.65" for Barn Cty 50 yr. event Inflow = 0.08 cfs @ 12.14 hrs, Volume= 601 cf Outflow = 0.05 cfs @ 12.49 hrs, Volume= 509 cf, Atten= 33%, Lag= 21.3 min Primary = 0.05 cfs @ 12.49 hrs, Volume= 509 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.94' @ 12.49 hrs Storage= 100 cf Plug-Flow detention time= 105.8 min calculated for 509 cf (85% of inflow) Center-of-Mass det. time= 38.7 min ( 976.0 - 937.3 ) Volume Invert Avail.Storage Storage Description #1 4.50' 130 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.50 0 5.00 115 5.50 130 Device Routing Invert Outlet Devices #1 Primary 4.90'Infiltration Model Elev. (feet) 4.90 5.10 5.50 Disch. (cfs) 0.000 0.300 0.310 Primary OutFlow Max=0.05 cfs @ 12.49 hrs HW=4.94' (Free Discharge) 1=Infiltration Model (Custom Controls 0.05 cfs) Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 25HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=11,171 sf Peak Elev=4.94' Storage=100 cf 0.08 cfs 0.05 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 Infiltration Model Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 26HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 13012512011511010510095908580757065605550454035302520151050Elevation (feet)5 Infiltration System Storage Model Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 27HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=11,171 sf 0.00% Impervious Runoff Depth>1.07"Subcatchment 1S: Drainage Area DA5 PROP Tc=5.0 min CN=39 Runoff=0.21 cfs 998 cf Peak Elev=5.00' Storage=114 cf Inflow=0.21 cfs 998 cfPond 1P: Low area drainage catchment Outflow=0.15 cfs 905 cf Total Runoff Area = 11,171 sf Runoff Volume = 998 cf Average Runoff Depth = 1.07" 100.00% Pervious = 11,171 sf 0.00% Impervious = 0 sf Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 28HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA5 PROP Time of Concentration Runoff = 0.21 cfs @ 12.11 hrs, Volume= 998 cf, Depth> 1.07" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 100 yr Rainfall=7.80" Area (sf) CN Description 11,171 39 >75% Grass cover, Good, HSG A * 0 98 Patio area * 0 55 Pervious gravel driveway 11,171 39 Weighted Average 11,171 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA5 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type III 24-hr Barn Cty 100 yr Rainfall=7.80" Runoff Area=11,171 sf Runoff Volume=998 cf Runoff Depth>1.07" Tc=5.0 min CN=39 0.21 cfs Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 29HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 11,171 sf, 0.00% Impervious, Inflow Depth > 1.07" for Barn Cty 100 yr event Inflow = 0.21 cfs @ 12.11 hrs, Volume= 998 cf Outflow = 0.15 cfs @ 12.29 hrs, Volume= 905 cf, Atten= 30%, Lag= 10.8 min Primary = 0.15 cfs @ 12.29 hrs, Volume= 905 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 5.00' @ 12.29 hrs Storage= 114 cf Plug-Flow detention time= 65.2 min calculated for 905 cf (91% of inflow) Center-of-Mass det. time= 21.1 min ( 934.4 - 913.3 ) Volume Invert Avail.Storage Storage Description #1 4.50' 130 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.50 0 5.00 115 5.50 130 Device Routing Invert Outlet Devices #1 Primary 4.90'Infiltration Model Elev. (feet) 4.90 5.10 5.50 Disch. (cfs) 0.000 0.300 0.310 Primary OutFlow Max=0.15 cfs @ 12.29 hrs HW=5.00' (Free Discharge) 1=Infiltration Model (Custom Controls 0.15 cfs) Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 30HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=11,171 sf Peak Elev=5.00' Storage=114 cf 0.21 cfs 0.15 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 Infiltration Model Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc Page 31HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 13012512011511010510095908580757065605550454035302520151050Elevation (feet)5 Infiltration System Storage Model Revised proposed conditions DA P5C:\Users\Public\Documents\HydroCAD\Projects\ Table of Contents150 SOUTH ST PROP DA P5 rev Prepared by Down Cape Engineering Inc HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (all nodes) 4 Soil Listing (all nodes) 5 Ground Covers (all nodes) 6 Notes Listing (all nodes) Barn Cty 2 Yr Event 7 Node Listing 8 Subcat 1S: Drainage Area DA5 PROP 9 Pond 1P: Low area drainage catchment Barn Cty 10 Yr Event 12 Node Listing 13 Subcat 1S: Drainage Area DA5 PROP 14 Pond 1P: Low area drainage catchment Barn Cty 25 Yr Event 17 Node Listing 18 Subcat 1S: Drainage Area DA5 PROP 19 Pond 1P: Low area drainage catchment Barn Cty 50 yr. Event 22 Node Listing 23 Subcat 1S: Drainage Area DA5 PROP 24 Pond 1P: Low area drainage catchment Barn Cty 100 yr Event 27 Node Listing 28 Subcat 1S: Drainage Area DA5 PROP 29 Pond 1P: Low area drainage catchment 1S Drainage Area DA6 PROP 1P Low area drainage catchment Routing Diagram for 150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 2HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 Barn Cty 2 Yr Type III 24-hr Default 24.00 1 3.39 2 2 Barn Cty 10 Yr Type III 24-hr Default 24.00 1 4.95 2 3 Barn Cty 25 Yr Type III 24-hr Default 24.00 1 5.92 2 4 Barn Cty 50 yr. Type III 24-hr Default 24.00 1 6.65 2 5 Barn Cty 100 yr Type III 24-hr Default 24.00 1 7.80 2 Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 3HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (sq-ft) CN Description (subcatchment-numbers) 40,328 39 >75% Grass cover, Good, HSG A (1S) 1,917 98 Abutting House area (1S) 42,245 42 TOTAL AREA Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 4HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (sq-ft) Soil Group Subcatchment Numbers 40,328 HSG A 1S 0 HSG B 0 HSG C 0 HSG D 1,917 Other 1S 42,245 TOTAL AREA Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 5HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (sq-ft) HSG-B (sq-ft) HSG-C (sq-ft) HSG-D (sq-ft) Other (sq-ft) Total (sq-ft) Ground Cover Subcatchment Numbers 40,328 0 0 0 0 40,328 >75% Grass cover, Good 0 0 0 0 1,917 1,917 Abutting House area 40,328 0 0 0 1,917 42,245 TOTAL AREA Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ 150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 6HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Notes Listing (all nodes) Line# Node Number Notes 1 1S Time of Concentration 2 1P Low drainage area 3"/hr infiltration rate model Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 7HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=42,245 sf 4.54% Impervious Runoff Depth>0.03"Subcatchment 1S: Drainage Area DA6 PROP Tc=5.0 min CN=42 Runoff=0.00 cfs 96 cf Peak Elev=4.00' Storage=11 cf Inflow=0.00 cfs 96 cfPond 1P: Low area drainage catchment Outflow=0.00 cfs 86 cf Total Runoff Area = 42,245 sf Runoff Volume = 96 cf Average Runoff Depth = 0.03" 95.46% Pervious = 40,328 sf 4.54% Impervious = 1,917 sf Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 8HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA6 PROP Time of Concentration Runoff = 0.00 cfs @ 16.94 hrs, Volume= 96 cf, Depth> 0.03" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 2 Yr Rainfall=3.39" Area (sf) CN Description 40,328 39 >75% Grass cover, Good, HSG A * 1,917 98 Abutting House area * 0 55 Pervious gravel driveway 42,245 42 Weighted Average 40,328 95.46% Pervious Area 1,917 4.54% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA6 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.003 0.003 0.003 0.003 0.003 0.002 0.002 0.002 0.002 0.002 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0 Type III 24-hr Barn Cty 2 Yr Rainfall=3.39" Runoff Area=42,245 sf Runoff Volume=96 cf Runoff Depth>0.03" Tc=5.0 min CN=42 0.00 cfs Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 9HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 42,245 sf, 4.54% Impervious, Inflow Depth > 0.03" for Barn Cty 2 Yr event Inflow = 0.00 cfs @ 16.94 hrs, Volume= 96 cf Outflow = 0.00 cfs @ 19.70 hrs, Volume= 86 cf, Atten= 8%, Lag= 165.1 min Primary = 0.00 cfs @ 19.70 hrs, Volume= 86 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.00' @ 19.70 hrs Storage= 11 cf Plug-Flow detention time= 59.8 min calculated for 86 cf (90% of inflow) Center-of-Mass det. time= 30.5 min ( 1,183.0 - 1,152.5 ) Volume Invert Avail.Storage Storage Description #1 4.00' 5,561 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.00 0 5.00 2,674 5.50 5,561 Device Routing Invert Outlet Devices #1 Primary 4.00'Infiltration Model Elev. (feet) 4.00 4.10 5.00 5.50 Disch. (cfs) 0.000 0.070 0.370 0.430 Primary OutFlow Max=0.00 cfs @ 19.70 hrs HW=4.00' (Free Discharge) 1=Infiltration Model (Custom Controls 0.00 cfs) Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 10HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.003 0.003 0.003 0.003 0.003 0.002 0.002 0.002 0.002 0.002 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0 Inflow Area=42,245 sf Peak Elev=4.00' Storage=11 cf 0.00 cfs 0.00 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.420.40.380.360.340.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 4 Infiltration Model Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 2 Yr Rainfall=3.39"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 11HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 5,5005,0004,5004,0003,5003,0002,5002,0001,5001,0005000Elevation (feet)5 4 Infiltration System Storage Model Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 12HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=42,245 sf 4.54% Impervious Runoff Depth>0.30"Subcatchment 1S: Drainage Area DA6 PROP Tc=5.0 min CN=42 Runoff=0.10 cfs 1,051 cf Peak Elev=4.06' Storage=150 cf Inflow=0.10 cfs 1,051 cfPond 1P: Low area drainage catchment Outflow=0.04 cfs 1,006 cf Total Runoff Area = 42,245 sf Runoff Volume = 1,051 cf Average Runoff Depth = 0.30" 95.46% Pervious = 40,328 sf 4.54% Impervious = 1,917 sf Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 13HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA6 PROP Time of Concentration Runoff = 0.10 cfs @ 12.37 hrs, Volume= 1,051 cf, Depth> 0.30" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 10 Yr Rainfall=4.95" Area (sf) CN Description 40,328 39 >75% Grass cover, Good, HSG A * 1,917 98 Abutting House area * 0 55 Pervious gravel driveway 42,245 42 Weighted Average 40,328 95.46% Pervious Area 1,917 4.54% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA6 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr Barn Cty 10 Yr Rainfall=4.95" Runoff Area=42,245 sf Runoff Volume=1,051 cf Runoff Depth>0.30" Tc=5.0 min CN=42 0.10 cfs Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 14HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 42,245 sf, 4.54% Impervious, Inflow Depth > 0.30" for Barn Cty 10 Yr event Inflow = 0.10 cfs @ 12.37 hrs, Volume= 1,051 cf Outflow = 0.04 cfs @ 13.94 hrs, Volume= 1,006 cf, Atten= 60%, Lag= 94.4 min Primary = 0.04 cfs @ 13.94 hrs, Volume= 1,006 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.06' @ 13.94 hrs Storage= 150 cf Plug-Flow detention time= 62.1 min calculated for 1,005 cf (96% of inflow) Center-of-Mass det. time= 42.7 min ( 1,016.3 - 973.6 ) Volume Invert Avail.Storage Storage Description #1 4.00' 5,561 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.00 0 5.00 2,674 5.50 5,561 Device Routing Invert Outlet Devices #1 Primary 4.00'Infiltration Model Elev. (feet) 4.00 4.10 5.00 5.50 Disch. (cfs) 0.000 0.070 0.370 0.430 Primary OutFlow Max=0.04 cfs @ 13.94 hrs HW=4.06' (Free Discharge) 1=Infiltration Model (Custom Controls 0.04 cfs) Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 15HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=42,245 sf Peak Elev=4.06' Storage=150 cf 0.10 cfs 0.04 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.420.40.380.360.340.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 4 Infiltration Model Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 10 Yr Rainfall=4.95"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 16HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 5,5005,0004,5004,0003,5003,0002,5002,0001,5001,0005000Elevation (feet)5 4 Infiltration System Storage Model Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 17HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=42,245 sf 4.54% Impervious Runoff Depth>0.59"Subcatchment 1S: Drainage Area DA6 PROP Tc=5.0 min CN=42 Runoff=0.29 cfs 2,065 cf Peak Elev=4.15' Storage=392 cf Inflow=0.29 cfs 2,065 cfPond 1P: Low area drainage catchment Outflow=0.09 cfs 1,993 cf Total Runoff Area = 42,245 sf Runoff Volume = 2,065 cf Average Runoff Depth = 0.59" 95.46% Pervious = 40,328 sf 4.54% Impervious = 1,917 sf Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 18HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA6 PROP Time of Concentration Runoff = 0.29 cfs @ 12.13 hrs, Volume= 2,065 cf, Depth> 0.59" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 25 Yr Rainfall=5.92" Area (sf) CN Description 40,328 39 >75% Grass cover, Good, HSG A * 1,917 98 Abutting House area * 0 55 Pervious gravel driveway 42,245 42 Weighted Average 40,328 95.46% Pervious Area 1,917 4.54% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA6 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr Barn Cty 25 Yr Rainfall=5.92" Runoff Area=42,245 sf Runoff Volume=2,065 cf Runoff Depth>0.59" Tc=5.0 min CN=42 0.29 cfs Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 19HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 42,245 sf, 4.54% Impervious, Inflow Depth > 0.59" for Barn Cty 25 Yr event Inflow = 0.29 cfs @ 12.13 hrs, Volume= 2,065 cf Outflow = 0.09 cfs @ 13.18 hrs, Volume= 1,993 cf, Atten= 70%, Lag= 62.7 min Primary = 0.09 cfs @ 13.18 hrs, Volume= 1,993 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.15' @ 13.18 hrs Storage= 392 cf Plug-Flow detention time= 66.7 min calculated for 1,993 cf (97% of inflow) Center-of-Mass det. time= 49.8 min ( 985.7 - 935.9 ) Volume Invert Avail.Storage Storage Description #1 4.00' 5,561 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.00 0 5.00 2,674 5.50 5,561 Device Routing Invert Outlet Devices #1 Primary 4.00'Infiltration Model Elev. (feet) 4.00 4.10 5.00 5.50 Disch. (cfs) 0.000 0.070 0.370 0.430 Primary OutFlow Max=0.09 cfs @ 13.18 hrs HW=4.15' (Free Discharge) 1=Infiltration Model (Custom Controls 0.09 cfs) Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 20HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=42,245 sf Peak Elev=4.15' Storage=392 cf 0.29 cfs 0.09 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.420.40.380.360.340.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 4 Infiltration Model Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 25 Yr Rainfall=5.92"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 21HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 5,5005,0004,5004,0003,5003,0002,5002,0001,5001,0005000Elevation (feet)5 4 Infiltration System Storage Model Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 22HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=42,245 sf 4.54% Impervious Runoff Depth>0.85"Subcatchment 1S: Drainage Area DA6 PROP Tc=5.0 min CN=42 Runoff=0.59 cfs 3,001 cf Peak Elev=4.26' Storage=704 cf Inflow=0.59 cfs 3,001 cfPond 1P: Low area drainage catchment Outflow=0.12 cfs 2,908 cf Total Runoff Area = 42,245 sf Runoff Volume = 3,001 cf Average Runoff Depth = 0.85" 95.46% Pervious = 40,328 sf 4.54% Impervious = 1,917 sf Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 23HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA6 PROP Time of Concentration Runoff = 0.59 cfs @ 12.11 hrs, Volume= 3,001 cf, Depth> 0.85" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 50 yr. Rainfall=6.65" Area (sf) CN Description 40,328 39 >75% Grass cover, Good, HSG A * 1,917 98 Abutting House area * 0 55 Pervious gravel driveway 42,245 42 Weighted Average 40,328 95.46% Pervious Area 1,917 4.54% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA6 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr Barn Cty 50 yr. Rainfall=6.65" Runoff Area=42,245 sf Runoff Volume=3,001 cf Runoff Depth>0.85" Tc=5.0 min CN=42 0.59 cfs Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 24HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 42,245 sf, 4.54% Impervious, Inflow Depth > 0.85" for Barn Cty 50 yr. event Inflow = 0.59 cfs @ 12.11 hrs, Volume= 3,001 cf Outflow = 0.12 cfs @ 13.07 hrs, Volume= 2,908 cf, Atten= 79%, Lag= 57.7 min Primary = 0.12 cfs @ 13.07 hrs, Volume= 2,908 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.26' @ 13.07 hrs Storage= 704 cf Plug-Flow detention time= 78.2 min calculated for 2,908 cf (97% of inflow) Center-of-Mass det. time= 62.4 min ( 980.4 - 918.0 ) Volume Invert Avail.Storage Storage Description #1 4.00' 5,561 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.00 0 5.00 2,674 5.50 5,561 Device Routing Invert Outlet Devices #1 Primary 4.00'Infiltration Model Elev. (feet) 4.00 4.10 5.00 5.50 Disch. (cfs) 0.000 0.070 0.370 0.430 Primary OutFlow Max=0.12 cfs @ 13.07 hrs HW=4.26' (Free Discharge) 1=Infiltration Model (Custom Controls 0.12 cfs) Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 25HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=42,245 sf Peak Elev=4.26' Storage=704 cf 0.59 cfs 0.12 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.420.40.380.360.340.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 4 Infiltration Model Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 50 yr. Rainfall=6.65"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 26HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 5,5005,0004,5004,0003,5003,0002,5002,0001,5001,0005000Elevation (feet)5 4 Infiltration System Storage Model Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 27HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Time span=1.00-24.00 hrs, dt=0.01 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=42,245 sf 4.54% Impervious Runoff Depth>1.34"Subcatchment 1S: Drainage Area DA6 PROP Tc=5.0 min CN=42 Runoff=1.18 cfs 4,733 cf Peak Elev=4.50' Storage=1,334 cf Inflow=1.18 cfs 4,733 cfPond 1P: Low area drainage catchment Outflow=0.20 cfs 4,601 cf Total Runoff Area = 42,245 sf Runoff Volume = 4,733 cf Average Runoff Depth = 1.34" 95.46% Pervious = 40,328 sf 4.54% Impervious = 1,917 sf Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 28HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Drainage Area DA6 PROP Time of Concentration Runoff = 1.18 cfs @ 12.10 hrs, Volume= 4,733 cf, Depth> 1.34" Routed to Pond 1P : Low area drainage catchment Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs Type III 24-hr Barn Cty 100 yr Rainfall=7.80" Area (sf) CN Description 40,328 39 >75% Grass cover, Good, HSG A * 1,917 98 Abutting House area * 0 55 Pervious gravel driveway 42,245 42 Weighted Average 40,328 95.46% Pervious Area 1,917 4.54% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time Concentration Subcatchment 1S: Drainage Area DA6 PROP Runoff Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)1 0 Type III 24-hr Barn Cty 100 yr Rainfall=7.80" Runoff Area=42,245 sf Runoff Volume=4,733 cf Runoff Depth>1.34" Tc=5.0 min CN=42 1.18 cfs Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 29HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Low area drainage catchment Low drainage area 3"/hr infiltration rate model Inflow Area = 42,245 sf, 4.54% Impervious, Inflow Depth > 1.34" for Barn Cty 100 yr event Inflow = 1.18 cfs @ 12.10 hrs, Volume= 4,733 cf Outflow = 0.20 cfs @ 12.99 hrs, Volume= 4,601 cf, Atten= 83%, Lag= 53.5 min Primary = 0.20 cfs @ 12.99 hrs, Volume= 4,601 cf Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 4.50' @ 12.99 hrs Storage= 1,334 cf Plug-Flow detention time= 92.0 min calculated for 4,599 cf (97% of inflow) Center-of-Mass det. time= 77.5 min ( 976.2 - 898.8 ) Volume Invert Avail.Storage Storage Description #1 4.00' 5,561 cf Infiltration System Storage Model Listed below Elevation Cum.Store (feet) (cubic-feet) 4.00 0 5.00 2,674 5.50 5,561 Device Routing Invert Outlet Devices #1 Primary 4.00'Infiltration Model Elev. (feet) 4.00 4.10 5.00 5.50 Disch. (cfs) 0.000 0.070 0.370 0.430 Primary OutFlow Max=0.20 cfs @ 12.99 hrs HW=4.50' (Free Discharge) 1=Infiltration Model (Custom Controls 0.20 cfs) Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 30HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Inflow Primary Hydrograph Time (hours) 242322212019181716151413121110987654321Flow (cfs)1 0 Inflow Area=42,245 sf Peak Elev=4.50' Storage=1,334 cf 1.18 cfs 0.20 cfs Pond 1P: Low area drainage catchment Primary Stage-Discharge Discharge (cfs) 0.420.40.380.360.340.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Elevation (feet)5 4 Infiltration Model Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Type III 24-hr Barn Cty 100 yr Rainfall=7.80"150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc Page 31HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC Pond 1P: Low area drainage catchment Storage Stage-Area-Storage Storage (cubic-feet) 5,5005,0004,5004,0003,5003,0002,5002,0001,5001,0005000Elevation (feet)5 4 Infiltration System Storage Model Revised proposed conditions DA P6C:\Users\Public\Documents\HydroCAD\Projects\ Table of Contents150 SOUTH ST PROP DA P6 rev Prepared by Down Cape Engineering Inc HydroCAD® 10.20-5b s/n 13540 © 2023 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (all nodes) 4 Soil Listing (all nodes) 5 Ground Covers (all nodes) 6 Notes Listing (all nodes) Barn Cty 2 Yr Event 7 Node Listing 8 Subcat 1S: Drainage Area DA6 PROP 9 Pond 1P: Low area drainage catchment Barn Cty 10 Yr Event 12 Node Listing 13 Subcat 1S: Drainage Area DA6 PROP 14 Pond 1P: Low area drainage catchment Barn Cty 25 Yr Event 17 Node Listing 18 Subcat 1S: Drainage Area DA6 PROP 19 Pond 1P: Low area drainage catchment Barn Cty 50 yr. Event 22 Node Listing 23 Subcat 1S: Drainage Area DA6 PROP 24 Pond 1P: Low area drainage catchment Barn Cty 100 yr Event 27 Node Listing 28 Subcat 1S: Drainage Area DA6 PROP 29 Pond 1P: Low area drainage catchment