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Proposed hydrology NOAA server
1S 1 2S 2 3S 3 ROOF 4 5P Rain Garden 8P Rtank 9L Offsite to north Routing Diagram for Proposed - 228 R28 r4 - NOAA server dataPrepared by Green Seal Environmental LLC, Printed 1/14/2025 HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link NOAA10 24-hr C 2-Year Rainfall=3.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 2HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: 1 Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0 cf, Depth= 0.00" Routed to Link 9L : Offsite to north Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA10 24-hr C 2-Year Rainfall=3.38" Area (sf) CN Description 15,292 30 Woods, Good, HSG A 15,160 39 >75% Grass cover, Good, HSG A 30,452 34 Weighted Average 30,452 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 30 0.0100 0.07 Sheet Flow, Sheet flow Grass: Dense n= 0.240 P2= 3.26" 5.1 152 0.0100 0.50 Shallow Concentrated Flow, Shallow concentrated flow Woodland Kv= 5.0 fps 12.2 182 Total Subcatchment 1S: 1 Runoff Hydrograph Time (hours)727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Runoff=0.00 cfs @ 0.00 hrs NOAA10 24-hr C 2-Year Rainfall=3.38" Runoff Area=30,452 sf Runoff Volume=0 cf Runoff Depth=0.00" Flow Length=182' Slope=0.0100 '/' Tc=12.2 min CN=34 0.00 cfs @ 0.00 hrs NOAA10 24-hr C 2-Year Rainfall=3.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 3HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: 2 Runoff = 1.62 cfs @ 12.13 hrs, Volume= 4,065 cf, Depth= 1.76" Routed to Pond 8P : Rtank Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA10 24-hr C 2-Year Rainfall=3.38" Area (sf) CN Description 7,280 39 >75% Grass cover, Good, HSG A 20,464 98 Paved parking, HSG A 27,744 83 Weighted Average 7,280 26.24% Pervious Area 20,464 73.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum value Subcatchment 2S: 2 Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Runoff=1.62 cfs @ 12.13 hrs NOAA10 24-hr C 2-Year Rainfall=3.38" Runoff Area=27,744 sf Runoff Volume=4,065 cf Runoff Depth=1.76" Tc=6.0 min CN=83 1.62 cfs @ 12.13 hrs NOAA10 24-hr C 2-Year Rainfall=3.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 4HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: 3 Runoff = 0.31 cfs @ 12.14 hrs, Volume= 864 cf, Depth= 0.78" Routed to Pond 5P : Rain Garden Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA10 24-hr C 2-Year Rainfall=3.38" Area (sf) CN Description 6,939 39 >75% Grass cover, Good, HSG A 5,415 98 Paved parking, HSG A * 873 98 RG Water surface area 13,227 67 Weighted Average 6,939 52.46% Pervious Area 6,288 47.54% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum value Subcatchment 3S: 3 Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 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 Runoff=0.31 cfs @ 12.14 hrs NOAA10 24-hr C 2-Year Rainfall=3.38" Runoff Area=13,227 sf Runoff Volume=864 cf Runoff Depth=0.78" Tc=6.0 min CN=67 0.31 cfs @ 12.14 hrs NOAA10 24-hr C 2-Year Rainfall=3.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 5HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment ROOF: 4 Runoff = 0.94 cfs @ 12.13 hrs, Volume= 2,750 cf, Depth= 3.15" Routed to Pond 8P : Rtank Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA10 24-hr C 2-Year Rainfall=3.38" Area (sf) CN Description 10,485 98 Roofs, HSG A 10,485 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum value Subcatchment ROOF: 4 Runoff Hydrograph Time (hours)727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Runoff=0.94 cfs @ 12.13 hrs NOAA10 24-hr C 2-Year Rainfall=3.38" Runoff Area=10,485 sf Runoff Volume=2,750 cf Runoff Depth=3.15" Tc=6.0 min CN=98 0.94 cfs @ 12.13 hrs NOAA10 24-hr C 2-Year Rainfall=3.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 6HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Pond 5P: Rain Garden Inflow Area = 13,227 sf, 47.54% Impervious, Inflow Depth = 0.78" for 2-Year event Inflow = 0.31 cfs @ 12.14 hrs, Volume= 864 cf Outflow = 0.07 cfs @ 12.39 hrs, Volume= 864 cf, Atten= 77%, Lag= 15.3 min Discarded = 0.07 cfs @ 12.39 hrs, Volume= 864 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 11.77' @ 12.39 hrs Surf.Area= 378 sf Storage= 171 cf Plug-Flow detention time= 17.4 min calculated for 864 cf (100% of inflow) Center-of-Mass det. time= 17.4 min ( 921.7 - 904.2 ) Volume Invert Avail.Storage Storage Description #1 11.00' 1,657 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 11.00 67 0 0 12.00 471 269 269 13.00 1,132 802 1,071 13.55 1,000 586 1,657 Device Routing Invert Outlet Devices #1 Discarded 11.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.07 cfs @ 12.39 hrs HW=11.77' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.07 cfs) NOAA10 24-hr C 2-Year Rainfall=3.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 7HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Pond 5P: Rain Garden Inflow Discarded Hydrograph Time (hours)727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 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=13,227 sf Inflow=0.31 cfs @ 12.14 hrs Discarded=0.07 cfs @ 12.39 hrs Peak Elev=11.77' Storage=171 cf 0.31 cfs @ 12.14 hrs 0.07 cfs @ 12.39 hrs Pond 5P: Rain Garden Discarded Stage-Discharge Discharge (cfs) 0.20.180.160.140.120.10.080.060.040.020 El e v a t i o n ( f e e t ) 13 12 11 Exfiltration NOAA10 24-hr C 2-Year Rainfall=3.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 8HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Pond 5P: Rain Garden Surface Storage Stage-Area-Storage Storage (cubic-feet)1,6001,4001,2001,0008006004002000 Surface/Horizontal/Wetted Area (sq-ft)1,1001,0009008007006005004003002001000 El e v a t i o n ( f e e t ) 13 12 11 Custom Stage Data NOAA10 24-hr C 2-Year Rainfall=3.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 9HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Pond 8P: Rtank Inflow Area = 38,229 sf, 80.96% Impervious, Inflow Depth = 2.14" for 2-Year event Inflow = 2.56 cfs @ 12.13 hrs, Volume= 6,814 cf Outflow = 0.70 cfs @ 11.96 hrs, Volume= 6,814 cf, Atten= 73%, Lag= 0.0 min Discarded = 0.70 cfs @ 11.96 hrs, Volume= 6,814 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 10.25' @ 12.30 hrs Surf.Area= 3,640 sf Storage= 1,073 cf Plug-Flow detention time= 6.5 min calculated for 6,813 cf (100% of inflow) Center-of-Mass det. time= 6.5 min ( 816.1 - 809.5 ) Volume Invert Avail.Storage Storage Description #1 9.97' 6,000 cf Ferguson R-Tank UD 2 x 720 Inside #2 Inside= 23.6"W x 27.2"H => 4.23 sf x 1.97'L = 8.3 cf Outside= 23.6"W x 27.2"H => 4.46 sf x 1.97'L = 8.8 cf 720 Chambers in 12 Rows #2 9.80' 1,842 cf 26.00'W x 140.00'L x 3.00'H Stone 10,920 cf Overall - 6,316 cf Embedded = 4,604 cf x 40.0% Voids 7,842 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 9.80'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.70 cfs @ 11.96 hrs HW=9.83' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.70 cfs) NOAA10 24-hr C 2-Year Rainfall=3.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 10HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Pond 8P: Rtank Inflow Discarded Hydrograph Time (hours)727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Inflow Area=38,229 sf Inflow=2.56 cfs @ 12.13 hrs Discarded=0.70 cfs @ 11.96 hrs Peak Elev=10.25' Storage=1,073 cf 2.56 cfs @ 12.13 hrs 0.70 cfs @ 11.96 hrs Pond 8P: Rtank Discarded Stage-Discharge Discharge (cfs) 0.650.60.550.50.450.40.350.30.250.20.150.10.050 El e v a t i o n ( f e e t ) 12 11 10 Exfiltration NOAA10 24-hr C 2-Year Rainfall=3.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 11HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Pond 8P: Rtank Surface Storage Stage-Area-Storage Storage (cubic-feet)7,0006,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)3,6003,4003,2003,0002,8002,6002,4002,2002,0001,8001,6001,4001,2001,0008006004002000 El e v a t i o n ( f e e t ) 12 11 10 Ferguson R-Tank UD 2 Stone NOAA10 24-hr C 2-Year Rainfall=3.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 12HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Link 9L: Offsite to north Inflow Area = 30,452 sf, 0.00% Impervious, Inflow Depth = 0.00" for 2-Year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Link 9L: Offsite to north Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Inflow Area=30,452 sf Inflow=0.00 cfs @ 0.00 hrs Primary=0.00 cfs @ 0.00 hrs 0.00 cfs @ 0.00 hrs0.00 cfs @ 0.00 hrs NOAA10 24-hr C 10-Year Rainfall=4.93"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 13HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: 1 Runoff = 0.00 cfs @ 19.86 hrs, Volume= 136 cf, Depth= 0.05" Routed to Link 9L : Offsite to north Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA10 24-hr C 10-Year Rainfall=4.93" Area (sf) CN Description 15,292 30 Woods, Good, HSG A 15,160 39 >75% Grass cover, Good, HSG A 30,452 34 Weighted Average 30,452 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 30 0.0100 0.07 Sheet Flow, Sheet flow Grass: Dense n= 0.240 P2= 3.26" 5.1 152 0.0100 0.50 Shallow Concentrated Flow, Shallow concentrated flow Woodland Kv= 5.0 fps 12.2 182 Total Subcatchment 1S: 1 Runoff Hydrograph Time (hours)727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.005 0.005 0.005 0.005 0.0040.004 0.004 0.004 0.004 0.003 0.003 0.003 0.003 0.0030.002 0.002 0.002 0.002 0.002 0.001 0.001 0.0010.001 0.001 0.000 0.000 0 Runoff=0.00 cfs @ 19.86 hrs NOAA10 24-hr C 10-Year Rainfall=4.93" Runoff Area=30,452 sf Runoff Volume=136 cf Runoff Depth=0.05" Flow Length=182' Slope=0.0100 '/' Tc=12.2 min CN=34 0.00 cfs @ 19.86 hrs NOAA10 24-hr C 10-Year Rainfall=4.93"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 14HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: 2 Runoff = 2.82 cfs @ 12.13 hrs, Volume= 7,192 cf, Depth= 3.11" Routed to Pond 8P : Rtank Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA10 24-hr C 10-Year Rainfall=4.93" Area (sf) CN Description 7,280 39 >75% Grass cover, Good, HSG A 20,464 98 Paved parking, HSG A 27,744 83 Weighted Average 7,280 26.24% Pervious Area 20,464 73.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum value Subcatchment 2S: 2 Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 3 2 1 0 Runoff=2.82 cfs @ 12.13 hrs NOAA10 24-hr C 10-Year Rainfall=4.93" Runoff Area=27,744 sf Runoff Volume=7,192 cf Runoff Depth=3.11" Tc=6.0 min CN=83 2.82 cfs @ 12.13 hrs NOAA10 24-hr C 10-Year Rainfall=4.93"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 15HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: 3 Runoff = 0.76 cfs @ 12.14 hrs, Volume= 1,934 cf, Depth= 1.75" Routed to Pond 5P : Rain Garden Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA10 24-hr C 10-Year Rainfall=4.93" Area (sf) CN Description 6,939 39 >75% Grass cover, Good, HSG A 5,415 98 Paved parking, HSG A * 873 98 RG Water surface area 13,227 67 Weighted Average 6,939 52.46% Pervious Area 6,288 47.54% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum value Subcatchment 3S: 3 Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 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 Runoff=0.76 cfs @ 12.14 hrs NOAA10 24-hr C 10-Year Rainfall=4.93" Runoff Area=13,227 sf Runoff Volume=1,934 cf Runoff Depth=1.75" Tc=6.0 min CN=67 0.76 cfs @ 12.14 hrs NOAA10 24-hr C 10-Year Rainfall=4.93"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 16HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment ROOF: 4 Runoff = 1.38 cfs @ 12.13 hrs, Volume= 4,101 cf, Depth= 4.69" Routed to Pond 8P : Rtank Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA10 24-hr C 10-Year Rainfall=4.93" Area (sf) CN Description 10,485 98 Roofs, HSG A 10,485 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum value Subcatchment ROOF: 4 Runoff Hydrograph Time (hours)727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Runoff=1.38 cfs @ 12.13 hrs NOAA10 24-hr C 10-Year Rainfall=4.93" Runoff Area=10,485 sf Runoff Volume=4,101 cf Runoff Depth=4.69" Tc=6.0 min CN=98 1.38 cfs @ 12.13 hrs NOAA10 24-hr C 10-Year Rainfall=4.93"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 17HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Pond 5P: Rain Garden Inflow Area = 13,227 sf, 47.54% Impervious, Inflow Depth = 1.75" for 10-Year event Inflow = 0.76 cfs @ 12.14 hrs, Volume= 1,934 cf Outflow = 0.14 cfs @ 12.42 hrs, Volume= 1,934 cf, Atten= 81%, Lag= 17.3 min Discarded = 0.14 cfs @ 12.42 hrs, Volume= 1,934 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 12.41' @ 12.42 hrs Surf.Area= 740 sf Storage= 515 cf Plug-Flow detention time= 34.3 min calculated for 1,934 cf (100% of inflow) Center-of-Mass det. time= 34.3 min ( 909.1 - 874.7 ) Volume Invert Avail.Storage Storage Description #1 11.00' 1,657 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 11.00 67 0 0 12.00 471 269 269 13.00 1,132 802 1,071 13.55 1,000 586 1,657 Device Routing Invert Outlet Devices #1 Discarded 11.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.14 cfs @ 12.42 hrs HW=12.41' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.14 cfs) NOAA10 24-hr C 10-Year Rainfall=4.93"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 18HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Pond 5P: Rain Garden Inflow Discarded Hydrograph Time (hours)727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 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=13,227 sf Inflow=0.76 cfs @ 12.14 hrs Discarded=0.14 cfs @ 12.42 hrs Peak Elev=12.41' Storage=515 cf 0.76 cfs @ 12.14 hrs 0.14 cfs @ 12.42 hrs Pond 5P: Rain Garden Discarded Stage-Discharge Discharge (cfs) 0.20.180.160.140.120.10.080.060.040.020 El e v a t i o n ( f e e t ) 13 12 11 Exfiltration NOAA10 24-hr C 10-Year Rainfall=4.93"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 19HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Pond 5P: Rain Garden Surface Storage Stage-Area-Storage Storage (cubic-feet)1,6001,4001,2001,0008006004002000 Surface/Horizontal/Wetted Area (sq-ft)1,1001,0009008007006005004003002001000 El e v a t i o n ( f e e t ) 13 12 11 Custom Stage Data NOAA10 24-hr C 10-Year Rainfall=4.93"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 20HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Pond 8P: Rtank Inflow Area = 38,229 sf, 80.96% Impervious, Inflow Depth = 3.54" for 10-Year event Inflow = 4.20 cfs @ 12.13 hrs, Volume= 11,293 cf Outflow = 0.70 cfs @ 11.85 hrs, Volume= 11,293 cf, Atten= 83%, Lag= 0.0 min Discarded = 0.70 cfs @ 11.85 hrs, Volume= 11,293 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 10.72' @ 12.41 hrs Surf.Area= 3,640 sf Storage= 2,499 cf Plug-Flow detention time= 17.8 min calculated for 11,293 cf (100% of inflow) Center-of-Mass det. time= 17.8 min ( 815.9 - 798.0 ) Volume Invert Avail.Storage Storage Description #1 9.97' 6,000 cf Ferguson R-Tank UD 2 x 720 Inside #2 Inside= 23.6"W x 27.2"H => 4.23 sf x 1.97'L = 8.3 cf Outside= 23.6"W x 27.2"H => 4.46 sf x 1.97'L = 8.8 cf 720 Chambers in 12 Rows #2 9.80' 1,842 cf 26.00'W x 140.00'L x 3.00'H Stone 10,920 cf Overall - 6,316 cf Embedded = 4,604 cf x 40.0% Voids 7,842 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 9.80'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.70 cfs @ 11.85 hrs HW=9.83' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.70 cfs) NOAA10 24-hr C 10-Year Rainfall=4.93"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 21HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Pond 8P: Rtank Inflow Discarded Hydrograph Time (hours)727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Inflow Area=38,229 sf Inflow=4.20 cfs @ 12.13 hrs Discarded=0.70 cfs @ 11.85 hrs Peak Elev=10.72' Storage=2,499 cf 4.20 cfs @ 12.13 hrs 0.70 cfs @ 11.85 hrs Pond 8P: Rtank Discarded Stage-Discharge Discharge (cfs) 0.650.60.550.50.450.40.350.30.250.20.150.10.050 El e v a t i o n ( f e e t ) 12 11 10 Exfiltration NOAA10 24-hr C 10-Year Rainfall=4.93"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 22HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Pond 8P: Rtank Surface Storage Stage-Area-Storage Storage (cubic-feet)7,0006,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)3,6003,4003,2003,0002,8002,6002,4002,2002,0001,8001,6001,4001,2001,0008006004002000 El e v a t i o n ( f e e t ) 12 11 10 Ferguson R-Tank UD 2 Stone NOAA10 24-hr C 10-Year Rainfall=4.93"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 23HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Link 9L: Offsite to north Inflow Area = 30,452 sf, 0.00% Impervious, Inflow Depth = 0.05" for 10-Year event Inflow = 0.00 cfs @ 19.86 hrs, Volume= 136 cf Primary = 0.00 cfs @ 19.86 hrs, Volume= 136 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Link 9L: Offsite to north Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.005 0.005 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0 Inflow Area=30,452 sf Inflow=0.00 cfs @ 19.86 hrs Primary=0.00 cfs @ 19.86 hrs 0.00 cfs @ 19.86 hrs0.00 cfs @ 19.86 hrs NOAA10 24-hr C 100-Year Rainfall=7.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 24HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: 1 Runoff = 0.11 cfs @ 12.32 hrs, Volume= 1,355 cf, Depth= 0.53" Routed to Link 9L : Offsite to north Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA10 24-hr C 100-Year Rainfall=7.38" Area (sf) CN Description 15,292 30 Woods, Good, HSG A 15,160 39 >75% Grass cover, Good, HSG A 30,452 34 Weighted Average 30,452 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 30 0.0100 0.07 Sheet Flow, Sheet flow Grass: Dense n= 0.240 P2= 3.26" 5.1 152 0.0100 0.50 Shallow Concentrated Flow, Shallow concentrated flow Woodland Kv= 5.0 fps 12.2 182 Total Subcatchment 1S: 1 Runoff Hydrograph Time (hours)727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.12 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 Runoff=0.11 cfs @ 12.32 hrs NOAA10 24-hr C 100-Year Rainfall=7.38" Runoff Area=30,452 sf Runoff Volume=1,355 cf Runoff Depth=0.53" Flow Length=182' Slope=0.0100 '/' Tc=12.2 min CN=34 0.11 cfs @ 12.32 hrs NOAA10 24-hr C 100-Year Rainfall=7.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 25HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: 2 Runoff = 4.75 cfs @ 12.13 hrs, Volume= 12,456 cf, Depth= 5.39" Routed to Pond 8P : Rtank Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA10 24-hr C 100-Year Rainfall=7.38" Area (sf) CN Description 7,280 39 >75% Grass cover, Good, HSG A 20,464 98 Paved parking, HSG A 27,744 83 Weighted Average 7,280 26.24% Pervious Area 20,464 73.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum value Subcatchment 2S: 2 Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 5 4 3 2 1 0 Runoff=4.75 cfs @ 12.13 hrs NOAA10 24-hr C 100-Year Rainfall=7.38" Runoff Area=27,744 sf Runoff Volume=12,456 cf Runoff Depth=5.39" Tc=6.0 min CN=83 4.75 cfs @ 12.13 hrs NOAA10 24-hr C 100-Year Rainfall=7.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 26HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: 3 Runoff = 1.59 cfs @ 12.13 hrs, Volume= 3,982 cf, Depth= 3.61" Routed to Pond 5P : Rain Garden Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA10 24-hr C 100-Year Rainfall=7.38" Area (sf) CN Description 6,939 39 >75% Grass cover, Good, HSG A 5,415 98 Paved parking, HSG A * 873 98 RG Water surface area 13,227 67 Weighted Average 6,939 52.46% Pervious Area 6,288 47.54% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum value Subcatchment 3S: 3 Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Runoff=1.59 cfs @ 12.13 hrs NOAA10 24-hr C 100-Year Rainfall=7.38" Runoff Area=13,227 sf Runoff Volume=3,982 cf Runoff Depth=3.61" Tc=6.0 min CN=67 1.59 cfs @ 12.13 hrs NOAA10 24-hr C 100-Year Rainfall=7.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 27HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment ROOF: 4 Runoff = 2.08 cfs @ 12.13 hrs, Volume= 6,239 cf, Depth= 7.14" Routed to Pond 8P : Rtank Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA10 24-hr C 100-Year Rainfall=7.38" Area (sf) CN Description 10,485 98 Roofs, HSG A 10,485 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum value Subcatchment ROOF: 4 Runoff Hydrograph Time (hours)727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Runoff=2.08 cfs @ 12.13 hrs NOAA10 24-hr C 100-Year Rainfall=7.38" Runoff Area=10,485 sf Runoff Volume=6,239 cf Runoff Depth=7.14" Tc=6.0 min CN=98 2.08 cfs @ 12.13 hrs NOAA10 24-hr C 100-Year Rainfall=7.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 28HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Pond 5P: Rain Garden Inflow Area = 13,227 sf, 47.54% Impervious, Inflow Depth = 3.61" for 100-Year event Inflow = 1.59 cfs @ 12.13 hrs, Volume= 3,982 cf Outflow = 0.22 cfs @ 13.44 hrs, Volume= 3,982 cf, Atten= 86%, Lag= 78.2 min Discarded = 0.22 cfs @ 13.44 hrs, Volume= 3,982 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 13.20' @ 12.55 hrs Surf.Area= 1,084 sf Storage= 1,294 cf Plug-Flow detention time= 57.4 min calculated for 3,981 cf (100% of inflow) Center-of-Mass det. time= 57.4 min ( 907.6 - 850.1 ) Volume Invert Avail.Storage Storage Description #1 11.00' 1,657 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 11.00 67 0 0 12.00 471 269 269 13.00 1,132 802 1,071 13.55 1,000 586 1,657 Device Routing Invert Outlet Devices #1 Discarded 11.00'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.22 cfs @ 13.44 hrs HW=13.00' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.22 cfs) NOAA10 24-hr C 100-Year Rainfall=7.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 29HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Pond 5P: Rain Garden Inflow Discarded Hydrograph Time (hours)727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Inflow Area=13,227 sf Inflow=1.59 cfs @ 12.13 hrs Discarded=0.22 cfs @ 13.44 hrs Peak Elev=13.20' Storage=1,294 cf 1.59 cfs @ 12.13 hrs 0.22 cfs @ 13.44 hrs Pond 5P: Rain Garden Discarded Stage-Discharge Discharge (cfs) 0.20.180.160.140.120.10.080.060.040.020 El e v a t i o n ( f e e t ) 13 12 11 Exfiltration NOAA10 24-hr C 100-Year Rainfall=7.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 30HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Pond 5P: Rain Garden Surface Storage Stage-Area-Storage Storage (cubic-feet)1,6001,4001,2001,0008006004002000 Surface/Horizontal/Wetted Area (sq-ft)1,1001,0009008007006005004003002001000 El e v a t i o n ( f e e t ) 13 12 11 Custom Stage Data NOAA10 24-hr C 100-Year Rainfall=7.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 31HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Pond 8P: Rtank Inflow Area = 38,229 sf, 80.96% Impervious, Inflow Depth = 5.87" for 100-Year event Inflow = 6.83 cfs @ 12.13 hrs, Volume= 18,695 cf Outflow = 0.70 cfs @ 11.67 hrs, Volume= 18,695 cf, Atten= 90%, Lag= 0.0 min Discarded = 0.70 cfs @ 11.67 hrs, Volume= 18,695 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 11.64' @ 12.60 hrs Surf.Area= 3,640 sf Storage= 5,254 cf Plug-Flow detention time= 45.0 min calculated for 18,692 cf (100% of inflow) Center-of-Mass det. time= 44.9 min ( 830.8 - 785.9 ) Volume Invert Avail.Storage Storage Description #1 9.97' 6,000 cf Ferguson R-Tank UD 2 x 720 Inside #2 Inside= 23.6"W x 27.2"H => 4.23 sf x 1.97'L = 8.3 cf Outside= 23.6"W x 27.2"H => 4.46 sf x 1.97'L = 8.8 cf 720 Chambers in 12 Rows #2 9.80' 1,842 cf 26.00'W x 140.00'L x 3.00'H Stone 10,920 cf Overall - 6,316 cf Embedded = 4,604 cf x 40.0% Voids 7,842 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 9.80'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.70 cfs @ 11.67 hrs HW=9.83' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.70 cfs) NOAA10 24-hr C 100-Year Rainfall=7.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 32HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Pond 8P: Rtank Inflow Discarded Hydrograph Time (hours)727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 7 6 5 4 3 2 1 0 Inflow Area=38,229 sf Inflow=6.83 cfs @ 12.13 hrs Discarded=0.70 cfs @ 11.67 hrs Peak Elev=11.64' Storage=5,254 cf 6.83 cfs @ 12.13 hrs 0.70 cfs @ 11.67 hrs Pond 8P: Rtank Discarded Stage-Discharge Discharge (cfs) 0.650.60.550.50.450.40.350.30.250.20.150.10.050 El e v a t i o n ( f e e t ) 12 11 10 Exfiltration NOAA10 24-hr C 100-Year Rainfall=7.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 33HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Pond 8P: Rtank Surface Storage Stage-Area-Storage Storage (cubic-feet)7,0006,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)3,6003,4003,2003,0002,8002,6002,4002,2002,0001,8001,6001,4001,2001,0008006004002000 El e v a t i o n ( f e e t ) 12 11 10 Ferguson R-Tank UD 2 Stone NOAA10 24-hr C 100-Year Rainfall=7.38"Proposed - 228 R28 r4 - NOAA server data Printed 1/14/2025Prepared by Green Seal Environmental LLC Page 34HydroCAD® 10.20-5c s/n 07546 © 2023 HydroCAD Software Solutions LLC Summary for Link 9L: Offsite to north Inflow Area = 30,452 sf, 0.00% Impervious, Inflow Depth = 0.53" for 100-Year event Inflow = 0.11 cfs @ 12.32 hrs, Volume= 1,355 cf Primary = 0.11 cfs @ 12.32 hrs, Volume= 1,355 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Link 9L: Offsite to north Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.12 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=30,452 sf Inflow=0.11 cfs @ 12.32 hrs Primary=0.11 cfs @ 12.32 hrs 0.11 cfs @ 12.32 hrs0.11 cfs @ 12.32 hrs