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HomeMy WebLinkAbout8807.Hydrocad Report - 8.9.23 (100-Year only)1 Existing Watershed 1 2 Existing Watershed 2 3 Existing Watershed 3 4 Existing Watershed 4 5 Existing Watershed 5 6 Existing Watershed 6 SR1 Discharge Point '1' - Site Runoff SR2 Discharge Point '2' - Site Runoff SR3 Discharge Point '3' - Site Runoff SR4 Discharge Point '4' - Site Runoff SR5 Discharge Point '5' - Site Runoff SR6 Discharge Point '6' - Site Runoff TSR Total Site Runoff Routing Diagram for 8807.PRE-DEV Prepared by J M O'Reilly & Associates Inc, Printed 8/9/2023 HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Subcat Reach Pond Link 8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 2HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 100-year Type III 24-hr Default 24.00 1 7.31 2 Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 3HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Time span=0.00-28.00 hrs, dt=0.03 hrs, 934 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=100,376 sf 0.00% Impervious Runoff Depth=0.80"Subcatchment 1: Existing Watershed 1 Flow Length=560' Tc=15.2 min CN=38 Runoff=0.88 cfs 0.154 af Runoff Area=30,064 sf 0.00% Impervious Runoff Depth=0.73"Subcatchment 2: Existing Watershed 2 Flow Length=230' Slope=0.0600 '/' Tc=10.2 min CN=37 Runoff=0.24 cfs 0.042 af Runoff Area=222,215 sf 0.00% Impervious Runoff Depth=0.80"Subcatchment 3: Existing Watershed 3 Flow Length=700' Tc=17.3 min CN=38 Runoff=1.89 cfs 0.342 af Runoff Area=114,596 sf 0.00% Impervious Runoff Depth=0.73"Subcatchment 4: Existing Watershed 4 Flow Length=330' Tc=12.8 min CN=37 Runoff=0.87 cfs 0.160 af Runoff Area=21,517 sf 0.00% Impervious Runoff Depth=0.73"Subcatchment 5: Existing Watershed 5 Flow Length=210' Tc=11.8 min CN=37 Runoff=0.17 cfs 0.030 af Runoff Area=22,962 sf 0.00% Impervious Runoff Depth=0.73"Subcatchment 6: Existing Watershed 6 Flow Length=250' Tc=18.5 min CN=37 Runoff=0.16 cfs 0.032 af Inflow=0.88 cfs 0.154 afLink SR1: Discharge Point '1' - Site Runoff Primary=0.88 cfs 0.154 af Inflow=0.24 cfs 0.042 afLink SR2: Discharge Point '2' - Site Runoff Primary=0.24 cfs 0.042 af Inflow=1.89 cfs 0.342 afLink SR3: Discharge Point '3' - Site Runoff Primary=1.89 cfs 0.342 af Inflow=0.87 cfs 0.160 afLink SR4: Discharge Point '4' - Site Runoff Primary=0.87 cfs 0.160 af Inflow=0.17 cfs 0.030 afLink SR5: Discharge Point '5' - Site Runoff Primary=0.17 cfs 0.030 af Inflow=0.16 cfs 0.032 afLink SR6: Discharge Point '6' - Site Runoff Primary=0.16 cfs 0.032 af Inflow=4.19 cfs 0.760 afLink TSR: Total Site Runoff Primary=4.19 cfs 0.760 af Total Runoff Area = 11.748 ac Runoff Volume = 0.760 af Average Runoff Depth = 0.78" 100.00% Pervious = 11.748 ac 0.00% Impervious = 0.000 ac Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 4HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1: Existing Watershed 1 Runoff = 0.88 cfs @ 12.39 hrs, Volume= 0.154 af, Depth= 0.80" Routed to Link SR1 : Discharge Point '1' - Site Runoff Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 74,376 36 Woods, Fair, HSG A 26,000 43 Woods/grass comb., Fair, HSG A 100,376 38 Weighted Average 100,376 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.8 50 0.0600 0.11 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 7.4 510 0.0530 1.15 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 15.2 560 Total Subcatchment 1: Existing Watershed 1 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)0.95 0.9 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 100-year Rainfall=7.31" Runoff Area=100,376 sf Runoff Volume=0.154 af Runoff Depth=0.80" Flow Length=560' Tc=15.2 min CN=38 0.88 cfs Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 5HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2: Existing Watershed 2 Runoff = 0.24 cfs @ 12.34 hrs, Volume= 0.042 af, Depth= 0.73" Routed to Link SR2 : Discharge Point '2' - Site Runoff Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 25,064 36 Woods, Fair, HSG A 5,000 43 Woods/grass comb., Fair, HSG A 30,064 37 Weighted Average 30,064 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.8 50 0.0600 0.11 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 2.4 180 0.0600 1.22 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 10.2 230 Total Subcatchment 2: Existing Watershed 2 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)0.26 0.25 0.24 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 100-year Rainfall=7.31" Runoff Area=30,064 sf Runoff Volume=0.042 af Runoff Depth=0.73" Flow Length=230' Slope=0.0600 '/' Tc=10.2 min CN=37 0.24 cfs Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 6HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3: Existing Watershed 3 Runoff = 1.89 cfs @ 12.43 hrs, Volume= 0.342 af, Depth= 0.80" Routed to Link SR3 : Discharge Point '3' - Site Runoff Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 169,215 36 Woods, Fair, HSG A 53,000 43 Woods/grass comb., Fair, HSG A 222,215 38 Weighted Average 222,215 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.8 50 0.0600 0.11 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 9.5 650 0.0520 1.14 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 17.3 700 Total Subcatchment 3: Existing Watershed 3 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)2 1 0 Type III 24-hr 100-year Rainfall=7.31" Runoff Area=222,215 sf Runoff Volume=0.342 af Runoff Depth=0.80" Flow Length=700' Tc=17.3 min CN=38 1.89 cfs Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 7HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 4: Existing Watershed 4 Runoff = 0.87 cfs @ 12.38 hrs, Volume= 0.160 af, Depth= 0.73" Routed to Link SR4 : Discharge Point '4' - Site Runoff Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 90,596 36 Woods, Fair, HSG A 24,000 43 Woods/grass comb., Fair, HSG A 114,596 37 Weighted Average 114,596 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.1 50 0.0400 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 3.7 280 0.0640 1.26 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 12.8 330 Total Subcatchment 4: Existing Watershed 4 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)0.95 0.9 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 100-year Rainfall=7.31" Runoff Area=114,596 sf Runoff Volume=0.160 af Runoff Depth=0.73" Flow Length=330' Tc=12.8 min CN=37 0.87 cfs Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 8HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5: Existing Watershed 5 Runoff = 0.17 cfs @ 12.37 hrs, Volume= 0.030 af, Depth= 0.73" Routed to Link SR5 : Discharge Point '5' - Site Runoff Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 17,017 36 Woods, Fair, HSG A 4,500 43 Woods/grass comb., Fair, HSG A 21,517 37 Weighted Average 21,517 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.1 50 0.0400 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 2.7 160 0.0380 0.97 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 11.8 210 Total Subcatchment 5: Existing Watershed 5 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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 100-year Rainfall=7.31" Runoff Area=21,517 sf Runoff Volume=0.030 af Runoff Depth=0.73" Flow Length=210' Tc=11.8 min CN=37 0.17 cfs Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 9HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 6: Existing Watershed 6 Runoff = 0.16 cfs @ 12.47 hrs, Volume= 0.032 af, Depth= 0.73" Routed to Link SR6 : Discharge Point '6' - Site Runoff Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 18,462 36 Woods, Fair, HSG A 4,500 43 Woods/grass comb., Fair, HSG A 22,962 37 Weighted Average 22,962 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.9 50 0.0100 0.05 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 2.6 200 0.0650 1.27 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 18.5 250 Total Subcatchment 6: Existing Watershed 6 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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 100-year Rainfall=7.31" Runoff Area=22,962 sf Runoff Volume=0.032 af Runoff Depth=0.73" Flow Length=250' Tc=18.5 min CN=37 0.16 cfs Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 10HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Link SR1: Discharge Point '1' - Site Runoff Inflow Area = 2.304 ac, 0.00% Impervious, Inflow Depth = 0.80" for 100-year event Inflow = 0.88 cfs @ 12.39 hrs, Volume= 0.154 af Primary = 0.88 cfs @ 12.39 hrs, Volume= 0.154 af, Atten= 0%, Lag= 0.0 min Routed to Link TSR : Total Site Runoff Primary outflow = Inflow, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Link SR1: Discharge Point '1' - Site Runoff Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)0.95 0.9 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=2.304 ac 0.88 cfs 0.88 cfs Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 11HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Link SR2: Discharge Point '2' - Site Runoff Inflow Area = 0.690 ac, 0.00% Impervious, Inflow Depth = 0.73" for 100-year event Inflow = 0.24 cfs @ 12.34 hrs, Volume= 0.042 af Primary = 0.24 cfs @ 12.34 hrs, Volume= 0.042 af, Atten= 0%, Lag= 0.0 min Routed to Link TSR : Total Site Runoff Primary outflow = Inflow, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Link SR2: Discharge Point '2' - Site Runoff Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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=0.690 ac 0.24 cfs 0.24 cfs Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 12HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Link SR3: Discharge Point '3' - Site Runoff Inflow Area = 5.101 ac, 0.00% Impervious, Inflow Depth = 0.80" for 100-year event Inflow = 1.89 cfs @ 12.43 hrs, Volume= 0.342 af Primary = 1.89 cfs @ 12.43 hrs, Volume= 0.342 af, Atten= 0%, Lag= 0.0 min Routed to Link TSR : Total Site Runoff Primary outflow = Inflow, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Link SR3: Discharge Point '3' - Site Runoff Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)2 1 0 Inflow Area=5.101 ac 1.89 cfs 1.89 cfs Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 13HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Link SR4: Discharge Point '4' - Site Runoff Inflow Area = 2.631 ac, 0.00% Impervious, Inflow Depth = 0.73" for 100-year event Inflow = 0.87 cfs @ 12.38 hrs, Volume= 0.160 af Primary = 0.87 cfs @ 12.38 hrs, Volume= 0.160 af, Atten= 0%, Lag= 0.0 min Routed to Link TSR : Total Site Runoff Primary outflow = Inflow, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Link SR4: Discharge Point '4' - Site Runoff Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)0.95 0.9 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=2.631 ac 0.87 cfs 0.87 cfs Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 14HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Link SR5: Discharge Point '5' - Site Runoff Inflow Area = 0.494 ac, 0.00% Impervious, Inflow Depth = 0.73" for 100-year event Inflow = 0.17 cfs @ 12.37 hrs, Volume= 0.030 af Primary = 0.17 cfs @ 12.37 hrs, Volume= 0.030 af, Atten= 0%, Lag= 0.0 min Routed to Link TSR : Total Site Runoff Primary outflow = Inflow, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Link SR5: Discharge Point '5' - Site Runoff Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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=0.494 ac 0.17 cfs 0.17 cfs Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 15HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Link SR6: Discharge Point '6' - Site Runoff Inflow Area = 0.527 ac, 0.00% Impervious, Inflow Depth = 0.73" for 100-year event Inflow = 0.16 cfs @ 12.47 hrs, Volume= 0.032 af Primary = 0.16 cfs @ 12.47 hrs, Volume= 0.032 af, Atten= 0%, Lag= 0.0 min Routed to Link TSR : Total Site Runoff Primary outflow = Inflow, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Link SR6: Discharge Point '6' - Site Runoff Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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=0.527 ac 0.16 cfs 0.16 cfs Type III 24-hr 100-year Rainfall=7.31"8807.PRE-DEV Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 16HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Link TSR: Total Site Runoff Inflow Area = 11.748 ac, 0.00% Impervious, Inflow Depth = 0.78" for 100-year event Inflow = 4.19 cfs @ 12.40 hrs, Volume= 0.760 af Primary = 4.19 cfs @ 12.40 hrs, Volume= 0.760 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Link TSR: Total Site Runoff Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)4 3 2 1 0 Inflow Area=11.748 ac 4.19 cfs 4.19 cfs 1 Non-Recharged Areas to Discharge Point '1' S1 Post-Development Watershed - S1 S2 Post-Development Watershed - S2 SW1 Swale Leaching - S1 SW2 Swale Leaching - S2 SR1 Discharge Point '1' - Site Runoff Routing Diagram for 8807.POST-DEV(SR1) Prepared by J M O'Reilly & Associates Inc, Printed 8/9/2023 HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Subcat Reach Pond Link 8807.POST-DEV(SR1) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 2HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 100-year Type III 24-hr Default 24.00 1 7.31 2 Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR1) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 3HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Time span=0.00-28.00 hrs, dt=0.03 hrs, 934 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=73,924 sf 0.00% Impervious Runoff Depth=0.80"Subcatchment 1: Non-Recharged Areas to Flow Length=500' Tc=15.0 min CN=38 Runoff=0.65 cfs 0.114 af Runoff Area=24,985 sf 24.00% Impervious Runoff Depth=2.13"Subcatchment S1: Post-Development Flow Length=160' Tc=9.5 min CN=53 Runoff=1.16 cfs 0.102 af Runoff Area=9,726 sf 0.00% Impervious Runoff Depth=0.88"Subcatchment S2: Post-Development Tc=6.0 min CN=39 Runoff=0.12 cfs 0.016 af Peak Elev=51.90' Storage=2,141 cf Inflow=1.16 cfs 0.102 afPond SW1: Swale Leaching - S1 Discarded=0.08 cfs 0.097 af Primary=0.00 cfs 0.000 af Outflow=0.08 cfs 0.097 af Peak Elev=38.16' Storage=109 cf Inflow=0.12 cfs 0.016 afPond SW2: Swale Leaching - S2 Discarded=0.04 cfs 0.016 af Primary=0.00 cfs 0.000 af Outflow=0.04 cfs 0.016 af Inflow=0.65 cfs 0.114 afLink SR1: Discharge Point '1' - Site Runoff Primary=0.65 cfs 0.114 af Total Runoff Area = 2.494 ac Runoff Volume = 0.232 af Average Runoff Depth = 1.12" 94.48% Pervious = 2.356 ac 5.52% Impervious = 0.138 ac Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR1) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 4HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1: Non-Recharged Areas to Discharge Point '1' Runoff = 0.65 cfs @ 12.39 hrs, Volume= 0.114 af, Depth= 0.80" Routed to Link SR1 : Discharge Point '1' - Site Runoff Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 55,424 36 Woods, Fair, HSG A 14,000 43 Woods/grass comb., Fair, HSG A 4,500 39 >75% Grass cover, Good, HSG A 73,924 38 Weighted Average 73,924 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.3 50 0.1000 0.13 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 8.7 450 0.0300 0.87 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 15.0 500 Total Subcatchment 1: Non-Recharged Areas to Discharge Point '1' Runoff Hydrograph Time (hours) 26242220181614121086420Flow (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 100-year Rainfall=7.31" Runoff Area=73,924 sf Runoff Volume=0.114 af Runoff Depth=0.80" Flow Length=500' Tc=15.0 min CN=38 0.65 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR1) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 5HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment S1: Post-Development Watershed - S1 Runoff = 1.16 cfs @ 12.15 hrs, Volume= 0.102 af, Depth= 2.13" Routed to Pond SW1 : Swale Leaching - S1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 5,997 98 Paved parking, HSG A 18,988 39 >75% Grass cover, Good, HSG A 24,985 53 Weighted Average 18,988 76.00% Pervious Area 5,997 24.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 50 0.0200 0.10 Sheet Flow, Grass: Dense n= 0.240 P2= 3.36" 1.5 110 0.0300 1.21 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 9.5 160 Total Subcatchment S1: Post-Development Watershed - S1 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)1 0 Type III 24-hr 100-year Rainfall=7.31" Runoff Area=24,985 sf Runoff Volume=0.102 af Runoff Depth=2.13" Flow Length=160' Tc=9.5 min CN=53 1.16 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR1) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 6HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment S2: Post-Development Watershed - S2 Runoff = 0.12 cfs @ 12.13 hrs, Volume= 0.016 af, Depth= 0.88" Routed to Pond SW2 : Swale Leaching - S2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 9,726 39 >75% Grass cover, Good, HSG A 9,726 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, (minimum) 5.0 0 Total, Increased to minimum Tc = 6.0 min Subcatchment S2: Post-Development Watershed - S2 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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 100-year Rainfall=7.31" Runoff Area=9,726 sf Runoff Volume=0.016 af Runoff Depth=0.88" Tc=6.0 min CN=39 0.12 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR1) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 7HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond SW1: Swale Leaching - S1 Inflow Area = 0.574 ac, 24.00% Impervious, Inflow Depth = 2.13" for 100-year event Inflow = 1.16 cfs @ 12.15 hrs, Volume= 0.102 af Outflow = 0.08 cfs @ 15.29 hrs, Volume= 0.097 af, Atten= 93%, Lag= 188.6 min Discarded = 0.08 cfs @ 15.29 hrs, Volume= 0.097 af Primary = 0.00 cfs @ 15.29 hrs, Volume= 0.000 af Routed to Link SR1 : Discharge Point '1' - Site Runoff Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 51.90' @ 15.29 hrs Surf.Area= 1,514 sf Storage= 2,141 cf Plug-Flow detention time= 308.8 min calculated for 0.097 af (95% of inflow) Center-of-Mass det. time= 283.4 min ( 1,155.3 - 871.9 ) Volume Invert Avail.Storage Storage Description #1 50.00' 2,293 cf Grassed Swale (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 50.00 779 139.0 0 0 779 52.00 1,559 210.0 2,293 2,293 2,781 Device Routing Invert Outlet Devices #1 Discarded 50.00'2.410 in/hr Exfiltration over Horizontal area Phase-In= 0.01' #2 Primary 51.90'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.08 cfs @ 15.29 hrs HW=51.90' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.08 cfs) Primary OutFlow Max=0.00 cfs @ 15.29 hrs HW=51.90' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir (Weir Controls 0.00 cfs @ 0.08 fps) Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR1) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 8HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond SW1: Swale Leaching - S1 Inflow Outflow Discarded Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)1 0 Inflow Area=0.574 ac Peak Elev=51.90' Storage=2,141 cf 1.16 cfs 0.08 cfs 0.08 cfs 0.00 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR1) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 9HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond SW2: Swale Leaching - S2 Inflow Area = 0.223 ac, 0.00% Impervious, Inflow Depth = 0.88" for 100-year event Inflow = 0.12 cfs @ 12.13 hrs, Volume= 0.016 af Outflow = 0.04 cfs @ 12.73 hrs, Volume= 0.016 af, Atten= 68%, Lag= 35.9 min Discarded = 0.04 cfs @ 12.73 hrs, Volume= 0.016 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Link SR1 : Discharge Point '1' - Site Runoff Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 38.16' @ 12.73 hrs Surf.Area= 704 sf Storage= 109 cf Plug-Flow detention time= 18.5 min calculated for 0.016 af (100% of inflow) Center-of-Mass det. time= 18.5 min ( 942.7 - 924.2 ) Volume Invert Avail.Storage Storage Description #1 38.00' 856 cf Grassed Swale (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 38.00 638 222.0 0 0 638 39.00 1,095 235.0 856 856 1,163 Device Routing Invert Outlet Devices #1 Discarded 38.00'2.410 in/hr Exfiltration over Horizontal area Phase-In= 0.01' #2 Primary 38.90'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.04 cfs @ 12.73 hrs HW=38.16' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=38.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR1) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 10HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond SW2: Swale Leaching - S2 Inflow Outflow Discarded Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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=0.223 ac Peak Elev=38.16' Storage=109 cf 0.12 cfs 0.04 cfs 0.04 cfs 0.00 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR1) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 11HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Link SR1: Discharge Point '1' - Site Runoff Inflow Area = 2.494 ac, 5.52% Impervious, Inflow Depth = 0.55" for 100-year event Inflow = 0.65 cfs @ 12.39 hrs, Volume= 0.114 af Primary = 0.65 cfs @ 12.39 hrs, Volume= 0.114 af, Atten= 0%, Lag= 0.0 min Routed to nonexistent node TSR Primary outflow = Inflow, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Link SR1: Discharge Point '1' - Site Runoff Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (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=2.494 ac 0.65 cfs 0.65 cfs M2A Runoff into Catch Basins - M2 M2B Direct Runoff into Swale - M2 S3 Post-Development Watershed - S3 2AR CB (7) CB's in Pavement 2BP (1) 70'x28' Leaching Facility - Two Rows of (5) 6'x6' Leach Pits, 14' O.C. with stone around 2BR CB (2) CB in Swale 2SW Dry Water Quality Swale SW3 Swale Leaching - S3 SR3 Discharge Point '3' - Site Runoff Routing Diagram for 8807.POST-DEV(SR3) Prepared by J M O'Reilly & Associates Inc, Printed 8/9/2023 HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Subcat Reach Pond Link 8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 2HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 100-year Type III 24-hr Default 24.00 1 7.31 2 Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 3HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Time span=0.00-28.00 hrs, dt=0.03 hrs, 934 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=124,298 sf 27.55% Impervious Runoff Depth=2.23"Subcatchment M2A: Runoff into Catch Flow Length=270' Tc=7.4 min CN=54 Runoff=6.58 cfs 0.529 af Runoff Area=55,434 sf 7.38% Impervious Runoff Depth=1.13"Subcatchment M2B: Direct Runoff into Flow Length=380' Tc=6.3 min CN=42 Runoff=1.13 cfs 0.119 af Runoff Area=76,968 sf 3.77% Impervious Runoff Depth=0.96"Subcatchment S3: Post-Development Flow Length=500' Tc=10.5 min CN=40 Runoff=1.00 cfs 0.142 af Peak Elev=36.27' Inflow=6.58 cfs 0.529 afPond 2AR: (7) CB's in Pavement 12.0" Round Culvert x 7.00 n=0.013 L=20.0' S=0.0350 '/' Outflow=6.58 cfs 0.529 af Peak Elev=32.44' Storage=7,111 cf Inflow=4.46 cfs 0.332 afPond 2BP: (1) 70'x28' Leaching Facility - Two Discarded=0.38 cfs 0.314 af Primary=0.29 cfs 0.018 af Outflow=0.66 cfs 0.332 af Peak Elev=33.06' Inflow=4.46 cfs 0.332 afPond 2BR: (2) CB in Swale 12.0" Round Culvert x 2.00 n=0.013 L=25.0' S=0.0400 '/' Outflow=4.46 cfs 0.332 af Peak Elev=34.81' Storage=5,972 cf Inflow=7.71 cfs 0.649 afPond 2SW: Dry Water Quality Swale Discarded=0.21 cfs 0.271 af Primary=4.46 cfs 0.332 af Outflow=4.67 cfs 0.603 af Peak Elev=28.86' Storage=2,046 cf Inflow=1.00 cfs 0.142 afPond SW3: Swale Leaching - S3 Discarded=0.16 cfs 0.142 af Primary=0.00 cfs 0.000 af Outflow=0.16 cfs 0.142 af Inflow=0.29 cfs 0.018 afLink SR3: Discharge Point '3' - Site Runoff Primary=0.29 cfs 0.018 af Total Runoff Area = 5.893 ac Runoff Volume = 0.790 af Average Runoff Depth = 1.61" 83.94% Pervious = 4.946 ac 16.06% Impervious = 0.947 ac Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 4HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment M2A: Runoff into Catch Basins - M2 Runoff = 6.58 cfs @ 12.12 hrs, Volume= 0.529 af, Depth= 2.23" Routed to Pond 2AR : (7) CB's in Pavement Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 34,244 98 Paved parking, HSG A 51,000 39 >75% Grass cover, Good, HSG A 39,054 36 Woods, Fair, HSG A 124,298 54 Weighted Average 90,054 72.45% Pervious Area 34,244 27.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.5 50 0.0500 0.15 Sheet Flow, Grass: Dense n= 0.240 P2= 3.36" 1.5 90 0.0200 0.99 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 0.4 130 0.0600 4.97 Shallow Concentrated Flow, Paved Kv= 20.3 fps 7.4 270 Total Subcatchment M2A: Runoff into Catch Basins - M2 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)7 6 5 4 3 2 1 0 Type III 24-hr 100-year Rainfall=7.31" Runoff Area=124,298 sf Runoff Volume=0.529 af Runoff Depth=2.23" Flow Length=270' Tc=7.4 min CN=54 6.58 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 5HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment M2B: Direct Runoff into Swale - M2 Runoff = 1.13 cfs @ 12.12 hrs, Volume= 0.119 af, Depth= 1.13" Routed to Pond 2SW : Dry Water Quality Swale Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 27,000 36 Woods, Fair, HSG A 24,345 39 >75% Grass cover, Good, HSG A 4,089 98 Paved parking, HSG A 55,434 42 Weighted Average 51,345 92.62% Pervious Area 4,089 7.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.5 50 0.1600 0.24 Sheet Flow, Grass: Dense n= 0.240 P2= 3.36" 2.8 330 0.0800 1.98 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 6.3 380 Total Subcatchment M2B: Direct Runoff into Swale - M2 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)1 0 Type III 24-hr 100-year Rainfall=7.31" Runoff Area=55,434 sf Runoff Volume=0.119 af Runoff Depth=1.13" Flow Length=380' Tc=6.3 min CN=42 1.13 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 6HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment S3: Post-Development Watershed - S3 Runoff = 1.00 cfs @ 12.21 hrs, Volume= 0.142 af, Depth= 0.96" Routed to Pond SW3 : Swale Leaching - S3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 2,900 98 Paved parking, HSG A 47,068 39 >75% Grass cover, Good, HSG A 27,000 36 Woods, Fair, HSG A 76,968 40 Weighted Average 74,068 96.23% Pervious Area 2,900 3.77% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.2 50 0.0400 0.13 Sheet Flow, Grass: Dense n= 0.240 P2= 3.21" 3.6 300 0.0400 1.40 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 0.7 150 0.1000 3.61 45.08 Channel Flow, Area= 12.5 sf Perim= 5.0' r= 2.50' n= 0.240 Sheet flow over Dense Grass 10.5 500 Total Subcatchment S3: Post-Development Watershed - S3 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)1 0 Type III 24-hr 100-year Rainfall=7.31" Runoff Area=76,968 sf Runoff Volume=0.142 af Runoff Depth=0.96" Flow Length=500' Tc=10.5 min CN=40 1.00 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 7HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 2AR: (7) CB's in Pavement Inflow Area = 2.853 ac, 27.55% Impervious, Inflow Depth = 2.23" for 100-year event Inflow = 6.58 cfs @ 12.12 hrs, Volume= 0.529 af Outflow = 6.58 cfs @ 12.12 hrs, Volume= 0.529 af, Atten= 0%, Lag= 0.0 min Primary = 6.58 cfs @ 12.12 hrs, Volume= 0.529 af Routed to Pond 2SW : Dry Water Quality Swale Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 36.27' @ 12.12 hrs Flood Elev= 38.20' Device Routing Invert Outlet Devices #1 Primary 35.70'12.0" Round Culvert X 7.00 L= 20.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 35.70' / 35.00' S= 0.0350 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.79 sf Primary OutFlow Max=6.55 cfs @ 12.12 hrs HW=36.27' TW=34.22' (Dynamic Tailwater) 1=Culvert (Inlet Controls 6.55 cfs @ 2.03 fps) Pond 2AR: (7) CB's in Pavement Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)7 6 5 4 3 2 1 0 Inflow Area=2.853 ac Peak Elev=36.27' 12.0" Round Culvert x 7.00 n=0.013 L=20.0' S=0.0350 '/' 6.58 cfs 6.58 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 8HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 2BP: (1) 70'x28' Leaching Facility - Two Rows of (5) 6'x6' Leach Pits, 14' O.C. with stone around Inflow Area = 4.126 ac, 21.33% Impervious, Inflow Depth = 0.97" for 100-year event Inflow = 4.46 cfs @ 12.29 hrs, Volume= 0.332 af Outflow = 0.66 cfs @ 13.75 hrs, Volume= 0.332 af, Atten= 85%, Lag= 87.5 min Discarded = 0.38 cfs @ 12.21 hrs, Volume= 0.314 af Primary = 0.29 cfs @ 13.75 hrs, Volume= 0.018 af Routed to Link SR3 : Discharge Point '3' - Site Runoff Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 32.44' @ 13.75 hrs Surf.Area= 1,960 sf Storage= 7,111 cf Plug-Flow detention time= 201.6 min calculated for 0.332 af (100% of inflow) Center-of-Mass det. time= 201.7 min ( 1,023.9 - 822.2 ) Volume Invert Avail.Storage Storage Description #1 26.00' 4,120 cf 28.00'W x 70.00'L x 6.50'H Prismatoid 12,740 cf Overall - 3,584 cf Embedded = 9,156 cf x 45.0% Voids #2 26.50' 3,054 cf 6.00'D x 6.00'H Vertical Cone/Cylinder x 18 Inside #1 3,584 cf Overall - 3.0" Wall Thickness = 3,054 cf 7,174 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 26.00'8.270 in/hr Exfiltration over Horizontal area Phase-In= 0.01' #2 Primary 32.40'10.0' long (Profile 6) Leaching Overflow Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.38 cfs @ 12.21 hrs HW=26.29' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.38 cfs) Primary OutFlow Max=0.29 cfs @ 13.75 hrs HW=32.44' TW=0.00' (Dynamic Tailwater) 2=Leaching Overflow (Weir Controls 0.29 cfs @ 0.65 fps) Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 9HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2BP: (1) 70'x28' Leaching Facility - Two Rows of (5) 6'x6' Leach Pits, 14' O.C. with stone around Inflow Outflow Discarded Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)4 3 2 1 0 Inflow Area=4.126 ac Peak Elev=32.44' Storage=7,111 cf 4.46 cfs 0.66 cfs 0.38 cfs 0.29 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 10HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 2BR: (2) CB in Swale Inflow Area = 4.126 ac, 21.33% Impervious, Inflow Depth = 0.97" for 100-year event Inflow = 4.46 cfs @ 12.29 hrs, Volume= 0.332 af Outflow = 4.46 cfs @ 12.29 hrs, Volume= 0.332 af, Atten= 0%, Lag= 0.0 min Primary = 4.46 cfs @ 12.29 hrs, Volume= 0.332 af Routed to Pond 2BP : (1) 70'x28' Leaching Facility - Two Rows of (5) 6'x6' Leach Pits, 14' O.C. with stone around Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 33.06' @ 12.29 hrs Flood Elev= 34.50' Device Routing Invert Outlet Devices #1 Primary 32.00'12.0" Round Culvert X 2.00 L= 25.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 32.00' / 31.00' S= 0.0400 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.79 sf Primary OutFlow Max=4.45 cfs @ 12.29 hrs HW=33.05' TW=27.26' (Dynamic Tailwater) 1=Culvert (Inlet Controls 4.45 cfs @ 2.83 fps) Pond 2BR: (2) CB in Swale Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)4 3 2 1 0 Inflow Area=4.126 ac Peak Elev=33.06' 12.0" Round Culvert x 2.00 n=0.013 L=25.0' S=0.0400 '/' 4.46 cfs 4.46 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 11HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 2SW: Dry Water Quality Swale Inflow Area = 4.126 ac, 21.33% Impervious, Inflow Depth = 1.89" for 100-year event Inflow = 7.71 cfs @ 12.12 hrs, Volume= 0.649 af Outflow = 4.67 cfs @ 12.29 hrs, Volume= 0.603 af, Atten= 39%, Lag= 10.2 min Discarded = 0.21 cfs @ 12.29 hrs, Volume= 0.271 af Primary = 4.46 cfs @ 12.29 hrs, Volume= 0.332 af Routed to Pond 2BR : (2) CB in Swale Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 34.81' @ 12.29 hrs Surf.Area= 3,731 sf Storage= 5,972 cf Plug-Flow detention time= 141.2 min calculated for 0.603 af (93% of inflow) Center-of-Mass det. time= 105.9 min ( 980.7 - 874.8 ) Volume Invert Avail.Storage Storage Description #1 33.00' 10,776 cf Dry Water Quality Swale (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 33.00 2,890 222.0 0 0 2,890 34.00 3,346 234.0 3,115 3,115 3,382 34.50 3,583 241.0 1,732 4,847 3,672 36.00 4,334 259.0 5,929 10,776 4,480 Device Routing Invert Outlet Devices #1 Discarded 33.00'2.410 in/hr Exfiltration over Horizontal area Phase-In= 0.01' #2 Primary 34.50'24.0" x 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.21 cfs @ 12.29 hrs HW=34.81' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.21 cfs) Primary OutFlow Max=4.45 cfs @ 12.29 hrs HW=34.81' TW=33.05' (Dynamic Tailwater) 2=Orifice/Grate (Weir Controls 4.45 cfs @ 1.81 fps) Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 12HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2SW: Dry Water Quality Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)8 7 6 5 4 3 2 1 0 Inflow Area=4.126 ac Peak Elev=34.81' Storage=5,972 cf 7.71 cfs 4.67 cfs 0.21 cfs 4.46 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 13HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond SW3: Swale Leaching - S3 Inflow Area = 1.767 ac, 3.77% Impervious, Inflow Depth = 0.96" for 100-year event Inflow = 1.00 cfs @ 12.21 hrs, Volume= 0.142 af Outflow = 0.16 cfs @ 15.24 hrs, Volume= 0.142 af, Atten= 85%, Lag= 181.9 min Discarded = 0.16 cfs @ 15.24 hrs, Volume= 0.142 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Link SR3 : Discharge Point '3' - Site Runoff Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 28.86' @ 15.24 hrs Surf.Area= 2,779 sf Storage= 2,046 cf Plug-Flow detention time= 153.1 min calculated for 0.142 af (100% of inflow) Center-of-Mass det. time= 153.1 min ( 1,075.5 - 922.5 ) Volume Invert Avail.Storage Storage Description #1 28.00' 5,894 cf Grassed Swale (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 28.00 2,004 189.0 0 0 2,004 30.00 4,004 312.0 5,894 5,894 6,933 Device Routing Invert Outlet Devices #1 Discarded 28.00'2.410 in/hr Exfiltration over Horizontal area Phase-In= 0.01' #2 Primary 29.90'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.16 cfs @ 15.24 hrs HW=28.86' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.16 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=28.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 14HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond SW3: Swale Leaching - S3 Inflow Outflow Discarded Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)1 0 Inflow Area=1.767 ac Peak Elev=28.86' Storage=2,046 cf 1.00 cfs 0.16 cfs 0.16 cfs 0.00 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR3) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 15HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Link SR3: Discharge Point '3' - Site Runoff Inflow Area = 5.893 ac, 16.06% Impervious, Inflow Depth = 0.04" for 100-year event Inflow = 0.29 cfs @ 13.75 hrs, Volume= 0.018 af Primary = 0.29 cfs @ 13.75 hrs, Volume= 0.018 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Link SR3: Discharge Point '3' - Site Runoff Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (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=5.893 ac 0.29 cfs 0.29 cfs 4 Non-Recharged Areas to Discharge Point '4' S4 Post-Development Watershed - S4 S5 Post-Development Watershed - S5 SW4 Swale Leaching - S4 SW5 Swale Leaching - S5 SR4 Discharge Point '4' - Site Runoff Routing Diagram for 8807.POST-DEV(SR4) Prepared by J M O'Reilly & Associates Inc, Printed 8/9/2023 HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Subcat Reach Pond Link 8807.POST-DEV(SR4) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 2HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 100-year Type III 24-hr Default 24.00 1 7.31 2 Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR4) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 3HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Time span=0.00-28.00 hrs, dt=0.03 hrs, 934 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=54,094 sf 0.00% Impervious Runoff Depth=0.73"Subcatchment 4: Non-Recharged Areas to Flow Length=250' Tc=8.3 min CN=37 Runoff=0.43 cfs 0.075 af Runoff Area=2,844 sf 27.81% Impervious Runoff Depth=2.32"Subcatchment S4: Post-Development Tc=6.0 min CN=55 Runoff=0.17 cfs 0.013 af Runoff Area=21,459 sf 6.33% Impervious Runoff Depth=1.13"Subcatchment S5: Post-Development Tc=6.0 min CN=42 Runoff=0.44 cfs 0.046 af Peak Elev=56.62' Storage=190 cf Inflow=0.17 cfs 0.013 afPond SW4: Swale Leaching - S4 Discarded=0.02 cfs 0.013 af Primary=0.00 cfs 0.000 af Outflow=0.02 cfs 0.013 af Peak Elev=48.83' Storage=687 cf Inflow=0.44 cfs 0.046 afPond SW5: Swale Leaching - S5 Discarded=0.05 cfs 0.046 af Primary=0.00 cfs 0.000 af Outflow=0.05 cfs 0.046 af Inflow=0.43 cfs 0.075 afLink SR4: Discharge Point '4' - Site Runoff Primary=0.43 cfs 0.075 af Total Runoff Area = 1.800 ac Runoff Volume = 0.134 af Average Runoff Depth = 0.90" 97.26% Pervious = 1.750 ac 2.74% Impervious = 0.049 ac Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR4) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 4HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 4: Non-Recharged Areas to Discharge Point '4' Runoff = 0.43 cfs @ 12.30 hrs, Volume= 0.075 af, Depth= 0.73" Routed to Link SR4 : Discharge Point '4' - Site Runoff Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 39,094 36 Woods, Fair, HSG A 8,000 43 Woods/grass comb., Fair, HSG A 7,000 39 >75% Grass cover, Good, HSG A 54,094 37 Weighted Average 54,094 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.3 50 0.1000 0.13 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 2.0 200 0.1100 1.66 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 8.3 250 Total Subcatchment 4: Non-Recharged Areas to Discharge Point '4' Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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 100-year Rainfall=7.31" Runoff Area=54,094 sf Runoff Volume=0.075 af Runoff Depth=0.73" Flow Length=250' Tc=8.3 min CN=37 0.43 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR4) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 5HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment S4: Post-Development Watershed - S4 Runoff = 0.17 cfs @ 12.10 hrs, Volume= 0.013 af, Depth= 2.32" Routed to Pond SW4 : Swale Leaching - S4 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 791 98 Paved parking, HSG A 2,053 39 >75% Grass cover, Good, HSG A 2,844 55 Weighted Average 2,053 72.19% Pervious Area 791 27.81% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, (minimum) 5.0 0 Total, Increased to minimum Tc = 6.0 min Subcatchment S4: Post-Development Watershed - S4 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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 100-year Rainfall=7.31" Runoff Area=2,844 sf Runoff Volume=0.013 af Runoff Depth=2.32" Tc=6.0 min CN=55 0.17 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR4) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 6HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment S5: Post-Development Watershed - S5 Runoff = 0.44 cfs @ 12.12 hrs, Volume= 0.046 af, Depth= 1.13" Routed to Pond SW5 : Swale Leaching - S5 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 1,359 98 Paved parking, HSG A 15,600 39 >75% Grass cover, Good, HSG A 4,500 36 Woods, Fair, HSG A 21,459 42 Weighted Average 20,100 93.67% Pervious Area 1,359 6.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, (minimum) 5.0 0 Total, Increased to minimum Tc = 6.0 min Subcatchment S5: Post-Development Watershed - S5 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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 100-year Rainfall=7.31" Runoff Area=21,459 sf Runoff Volume=0.046 af Runoff Depth=1.13" Tc=6.0 min CN=42 0.44 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR4) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 7HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond SW4: Swale Leaching - S4 Inflow Area = 0.065 ac, 27.81% Impervious, Inflow Depth = 2.32" for 100-year event Inflow = 0.17 cfs @ 12.10 hrs, Volume= 0.013 af Outflow = 0.02 cfs @ 13.03 hrs, Volume= 0.013 af, Atten= 88%, Lag= 55.7 min Discarded = 0.02 cfs @ 13.03 hrs, Volume= 0.013 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Link SR4 : Discharge Point '4' - Site Runoff Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 56.62' @ 13.03 hrs Surf.Area= 365 sf Storage= 190 cf Plug-Flow detention time= 91.2 min calculated for 0.013 af (100% of inflow) Center-of-Mass det. time= 91.1 min ( 954.4 - 863.3 ) Volume Invert Avail.Storage Storage Description #1 56.00' 342 cf Grassed Swale (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 56.00 248 92.0 0 0 248 57.00 446 105.0 342 342 474 Device Routing Invert Outlet Devices #1 Discarded 56.00'2.410 in/hr Exfiltration over Horizontal area Phase-In= 0.01' #2 Primary 56.90'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.02 cfs @ 13.03 hrs HW=56.62' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.02 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=56.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR4) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 8HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond SW4: Swale Leaching - S4 Inflow Outflow Discarded Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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=0.065 ac Peak Elev=56.62' Storage=190 cf 0.17 cfs 0.02 cfs 0.02 cfs 0.00 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR4) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 9HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond SW5: Swale Leaching - S5 Inflow Area = 0.493 ac, 6.33% Impervious, Inflow Depth = 1.13" for 100-year event Inflow = 0.44 cfs @ 12.12 hrs, Volume= 0.046 af Outflow = 0.05 cfs @ 14.85 hrs, Volume= 0.046 af, Atten= 88%, Lag= 164.0 min Discarded = 0.05 cfs @ 14.85 hrs, Volume= 0.046 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Link SR4 : Discharge Point '4' - Site Runoff Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 48.83' @ 14.85 hrs Surf.Area= 936 sf Storage= 687 cf Plug-Flow detention time= 148.4 min calculated for 0.046 af (100% of inflow) Center-of-Mass det. time= 148.3 min ( 1,056.2 - 907.9 ) Volume Invert Avail.Storage Storage Description #1 48.00' 849 cf Grassed Swale (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 48.00 721 125.0 0 0 721 49.00 983 137.0 849 849 1,003 Device Routing Invert Outlet Devices #1 Discarded 48.00'2.410 in/hr Exfiltration over Horizontal area Phase-In= 0.01' #2 Primary 48.90'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.05 cfs @ 14.85 hrs HW=48.83' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.05 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=48.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR4) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 10HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond SW5: Swale Leaching - S5 Inflow Outflow Discarded Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.493 ac Peak Elev=48.83' Storage=687 cf 0.44 cfs 0.05 cfs 0.05 cfs 0.00 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR4) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 11HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Link SR4: Discharge Point '4' - Site Runoff Inflow Area = 1.800 ac, 2.74% Impervious, Inflow Depth = 0.50" for 100-year event Inflow = 0.43 cfs @ 12.30 hrs, Volume= 0.075 af Primary = 0.43 cfs @ 12.30 hrs, Volume= 0.075 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Link SR4: Discharge Point '4' - Site Runoff Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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=1.800 ac 0.43 cfs 0.43 cfs 5 Non-Recharged Areas to Discharge Point '5' SR5 Discharge Point '5' - Site Runoff Routing Diagram for 8807.POST-DEV(SR5) Prepared by J M O'Reilly & Associates Inc, Printed 8/9/2023 HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Subcat Reach Pond Link 8807.POST-DEV(SR5) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 2HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 100-year Type III 24-hr Default 24.00 1 7.31 2 Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR5) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 3HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Time span=0.00-28.00 hrs, dt=0.03 hrs, 934 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=17,701 sf 0.00% Impervious Runoff Depth=0.80"Subcatchment 5: Non-Recharged Areas to Flow Length=160' Tc=11.7 min CN=38 Runoff=0.16 cfs 0.027 af Inflow=0.16 cfs 0.027 afLink SR5: Discharge Point '5' - Site Runoff Primary=0.16 cfs 0.027 af Total Runoff Area = 0.406 ac Runoff Volume = 0.027 af Average Runoff Depth = 0.80" 100.00% Pervious = 0.406 ac 0.00% Impervious = 0.000 ac Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR5) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 4HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5: Non-Recharged Areas to Discharge Point '5' Runoff = 0.16 cfs @ 12.33 hrs, Volume= 0.027 af, Depth= 0.80" Routed to Link SR5 : Discharge Point '5' - Site Runoff Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 9,201 36 Woods, Fair, HSG A * 2,500 43 Woods/grass comb., Fair, HSG A 6,000 39 >75% Grass cover, Good, HSG A 17,701 38 Weighted Average 17,701 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 50 0.0200 0.10 Sheet Flow, Grass: Dense n= 0.240 P2= 3.36" 3.7 110 0.0100 0.50 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 11.7 160 Total Subcatchment 5: Non-Recharged Areas to Discharge Point '5' Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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 100-year Rainfall=7.31" Runoff Area=17,701 sf Runoff Volume=0.027 af Runoff Depth=0.80" Flow Length=160' Tc=11.7 min CN=38 0.16 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR5) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 5HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Link SR5: Discharge Point '5' - Site Runoff Inflow Area = 0.406 ac, 0.00% Impervious, Inflow Depth = 0.80" for 100-year event Inflow = 0.16 cfs @ 12.33 hrs, Volume= 0.027 af Primary = 0.16 cfs @ 12.33 hrs, Volume= 0.027 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Link SR5: Discharge Point '5' - Site Runoff Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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=0.406 ac 0.16 cfs 0.16 cfs M1A Runoff into Catch Basins - M1 M1B Direct Runoff into Swale - M1 N6 Non-Recharged Areas to Discharge Point '6' 1AR CB (2) CB's in Pavement 1BP (1) 28'x14' Leaching Facility - (2) 6'x6' Leach Pits, 14' O.C. with stone around 1BR CB (1) CB in Swale 1SW Dry Water Quality Swale SR6 Discharge Point '6' - Site Runoff Routing Diagram for 8807.POST-DEV(SR6) Prepared by J M O'Reilly & Associates Inc, Printed 8/9/2023 HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Subcat Reach Pond Link 8807.POST-DEV(SR6) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 2HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 100-year Type III 24-hr Default 24.00 1 7.31 2 Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR6) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 3HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Time span=0.00-28.00 hrs, dt=0.03 hrs, 934 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=23,930 sf 26.27% Impervious Runoff Depth=2.23"Subcatchment M1A: Runoff into Catch Flow Length=160' Tc=6.0 min CN=54 Runoff=1.33 cfs 0.102 af Runoff Area=7,973 sf 0.00% Impervious Runoff Depth=0.88"Subcatchment M1B: Direct Runoff into Tc=6.0 min CN=39 Runoff=0.10 cfs 0.013 af Runoff Area=362 sf 0.00% Impervious Runoff Depth=1.21"Subcatchment N6: Non-Recharged Areas to Tc=6.0 min CN=43 Runoff=0.01 cfs 0.001 af Peak Elev=51.77' Inflow=1.33 cfs 0.102 afPond 1AR: (2) CB's in Pavement 12.0" Round Culvert x 2.00 n=0.013 L=30.0' S=0.0267 '/' Outflow=1.33 cfs 0.102 af Peak Elev=47.72' Storage=1,291 cf Inflow=1.29 cfs 0.064 afPond 1BP: (1) 28'x14' Leaching Facility - (2) Discarded=0.08 cfs 0.058 af Primary=0.12 cfs 0.006 af Outflow=0.20 cfs 0.064 af Peak Elev=48.19' Inflow=1.29 cfs 0.064 afPond 1BR: (1) CB in Swale 12.0" Round Culvert n=0.013 L=10.0' S=0.0700 '/' Outflow=1.29 cfs 0.064 af Peak Elev=50.13' Storage=780 cf Inflow=1.43 cfs 0.115 afPond 1SW: Dry Water Quality Swale Discarded=0.04 cfs 0.046 af Primary=1.29 cfs 0.064 af Outflow=1.32 cfs 0.110 af Inflow=0.12 cfs 0.006 afLink SR6: Discharge Point '6' - Site Runoff Primary=0.12 cfs 0.006 af Total Runoff Area = 0.741 ac Runoff Volume = 0.116 af Average Runoff Depth = 1.88" 80.52% Pervious = 0.596 ac 19.48% Impervious = 0.144 ac Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR6) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 4HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment M1A: Runoff into Catch Basins - M1 Runoff = 1.33 cfs @ 12.10 hrs, Volume= 0.102 af, Depth= 2.23" Routed to Pond 1AR : (2) CB's in Pavement Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 6,286 98 Paved parking, HSG A 15,144 39 >75% Grass cover, Good, HSG A 2,500 36 Woods, Fair, HSG A 23,930 54 Weighted Average 17,644 73.73% Pervious Area 6,286 26.27% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.2 50 0.0600 0.16 Sheet Flow, Grass: Dense n= 0.240 P2= 3.36" 0.5 50 0.0600 1.71 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 0.3 60 0.0300 3.52 Shallow Concentrated Flow, Paved Kv= 20.3 fps 6.0 160 Total Subcatchment M1A: Runoff into Catch Basins - M1 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)1 0 Type III 24-hr 100-year Rainfall=7.31" Runoff Area=23,930 sf Runoff Volume=0.102 af Runoff Depth=2.23" Flow Length=160' Tc=6.0 min CN=54 1.33 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR6) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 5HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment M1B: Direct Runoff into Swale - M1 Runoff = 0.10 cfs @ 12.13 hrs, Volume= 0.013 af, Depth= 0.88" Routed to Pond 1SW : Dry Water Quality Swale Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 7,973 39 >75% Grass cover, Good, HSG A 7,973 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, (minimum) 5.0 0 Total, Increased to minimum Tc = 6.0 min Subcatchment M1B: Direct Runoff into Swale - M1 Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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 100-year Rainfall=7.31" Runoff Area=7,973 sf Runoff Volume=0.013 af Runoff Depth=0.88" Tc=6.0 min CN=39 0.10 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR6) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 6HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment N6: Non-Recharged Areas to Discharge Point '6' Runoff = 0.01 cfs @ 12.12 hrs, Volume= 0.001 af, Depth= 1.21" Routed to Link SR6 : Discharge Point '6' - Site Runoff Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 362 43 Woods/grass comb., Fair, HSG A 362 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, (minimum) Subcatchment N6: Non-Recharged Areas to Discharge Point '6' Runoff Hydrograph Time (hours) 26242220181614121086420Flow (cfs)0.009 0.009 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 100-year Rainfall=7.31" Runoff Area=362 sf Runoff Volume=0.001 af Runoff Depth=1.21" Tc=6.0 min CN=43 0.01 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR6) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 7HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1AR: (2) CB's in Pavement Inflow Area = 0.549 ac, 26.27% Impervious, Inflow Depth = 2.23" for 100-year event Inflow = 1.33 cfs @ 12.10 hrs, Volume= 0.102 af Outflow = 1.33 cfs @ 12.10 hrs, Volume= 0.102 af, Atten= 0%, Lag= 0.0 min Primary = 1.33 cfs @ 12.10 hrs, Volume= 0.102 af Routed to Pond 1SW : Dry Water Quality Swale Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 51.77' @ 12.10 hrs Flood Elev= 53.80' Device Routing Invert Outlet Devices #1 Primary 51.30'12.0" Round Culvert X 2.00 L= 30.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 51.30' / 50.50' S= 0.0267 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.79 sf Primary OutFlow Max=1.32 cfs @ 12.10 hrs HW=51.77' TW=50.01' (Dynamic Tailwater) 1=Culvert (Inlet Controls 1.32 cfs @ 1.84 fps) Pond 1AR: (2) CB's in Pavement Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)1 0 Inflow Area=0.549 ac Peak Elev=51.77' 12.0" Round Culvert x 2.00 n=0.013 L=30.0' S=0.0267 '/' 1.33 cfs 1.33 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR6) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 8HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1BP: (1) 28'x14' Leaching Facility - (2) 6'x6' Leach Pits, 14' O.C. with stone around Inflow Area = 0.732 ac, 19.70% Impervious, Inflow Depth = 1.05" for 100-year event Inflow = 1.29 cfs @ 12.15 hrs, Volume= 0.064 af Outflow = 0.20 cfs @ 12.97 hrs, Volume= 0.064 af, Atten= 85%, Lag= 49.1 min Discarded = 0.08 cfs @ 12.12 hrs, Volume= 0.058 af Primary = 0.12 cfs @ 12.97 hrs, Volume= 0.006 af Routed to Link SR6 : Discharge Point '6' - Site Runoff Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 47.72' @ 12.96 hrs Surf.Area= 392 sf Storage= 1,291 cf Plug-Flow detention time= 180.8 min calculated for 0.064 af (100% of inflow) Center-of-Mass det. time= 180.7 min ( 991.6 - 810.9 ) Volume Invert Avail.Storage Storage Description #1 41.30' 967 cf 14.00'W x 28.00'L x 6.50'H Prismatoid 2,548 cf Overall - 398 cf Embedded = 2,150 cf x 45.0% Voids #2 41.80' 339 cf 6.00'D x 6.00'H Vertical Cone/Cylinder x 2 Inside #1 398 cf Overall - 3.0" Wall Thickness = 339 cf 1,307 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 41.30'8.270 in/hr Exfiltration over Horizontal area Phase-In= 0.01' #2 Primary 47.70'10.0' long (Profile 6) Leaching Overflow Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.08 cfs @ 12.12 hrs HW=41.60' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.08 cfs) Primary OutFlow Max=0.11 cfs @ 12.97 hrs HW=47.72' TW=0.00' (Dynamic Tailwater) 2=Leaching Overflow (Weir Controls 0.11 cfs @ 0.47 fps) Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR6) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 9HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1BP: (1) 28'x14' Leaching Facility - (2) 6'x6' Leach Pits, 14' O.C. with stone around Inflow Outflow Discarded Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)1 0 Inflow Area=0.732 ac Peak Elev=47.72' Storage=1,291 cf 1.29 cfs 0.20 cfs 0.08 cfs0.12 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR6) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 10HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1BR: (1) CB in Swale Inflow Area = 0.732 ac, 19.70% Impervious, Inflow Depth = 1.05" for 100-year event Inflow = 1.29 cfs @ 12.15 hrs, Volume= 0.064 af Outflow = 1.29 cfs @ 12.15 hrs, Volume= 0.064 af, Atten= 0%, Lag= 0.0 min Primary = 1.29 cfs @ 12.15 hrs, Volume= 0.064 af Routed to Pond 1BP : (1) 28'x14' Leaching Facility - (2) 6'x6' Leach Pits, 14' O.C. with stone around Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 48.19' @ 12.15 hrs Flood Elev= 50.00' Device Routing Invert Outlet Devices #1 Primary 47.50'12.0" Round Culvert L= 10.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 47.50' / 46.80' S= 0.0700 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.79 sf Primary OutFlow Max=1.28 cfs @ 12.15 hrs HW=48.18' TW=42.24' (Dynamic Tailwater) 1=Culvert (Inlet Controls 1.28 cfs @ 2.22 fps) Pond 1BR: (1) CB in Swale Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)1 0 Inflow Area=0.732 ac Peak Elev=48.19' 12.0" Round Culvert n=0.013 L=10.0' S=0.0700 '/' 1.29 cfs 1.29 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR6) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 11HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1SW: Dry Water Quality Swale Inflow Area = 0.732 ac, 19.70% Impervious, Inflow Depth = 1.89" for 100-year event Inflow = 1.43 cfs @ 12.10 hrs, Volume= 0.115 af Outflow = 1.32 cfs @ 12.15 hrs, Volume= 0.110 af, Atten= 7%, Lag= 3.1 min Discarded = 0.04 cfs @ 12.15 hrs, Volume= 0.046 af Primary = 1.29 cfs @ 12.15 hrs, Volume= 0.064 af Routed to Pond 1BR : (1) CB in Swale Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 50.13' @ 12.15 hrs Surf.Area= 654 sf Storage= 780 cf Plug-Flow detention time= 112.3 min calculated for 0.110 af (95% of inflow) Center-of-Mass det. time= 86.7 min ( 959.4 - 872.7 ) Volume Invert Avail.Storage Storage Description #1 48.50' 2,417 cf Dry Water Quality Swale (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 48.50 319 92.0 0 0 319 50.00 624 111.0 695 695 662 50.50 738 117.0 340 1,035 784 52.00 1,118 136.0 1,382 2,417 1,212 Device Routing Invert Outlet Devices #1 Discarded 48.50'2.410 in/hr Exfiltration over Horizontal area Phase-In= 0.01' #2 Primary 50.00'24.0" x 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.04 cfs @ 12.15 hrs HW=50.13' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=1.28 cfs @ 12.15 hrs HW=50.13' TW=48.18' (Dynamic Tailwater) 2=Orifice/Grate (Weir Controls 1.28 cfs @ 1.19 fps) Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR6) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 12HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Dry Water Quality Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)1 0 Inflow Area=0.732 ac Peak Elev=50.13' Storage=780 cf 1.43 cfs 1.32 cfs 0.04 cfs 1.29 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(SR6) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 13HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Link SR6: Discharge Point '6' - Site Runoff Inflow Area = 0.741 ac, 19.48% Impervious, Inflow Depth = 0.10" for 100-year event Inflow = 0.12 cfs @ 12.97 hrs, Volume= 0.006 af Primary = 0.12 cfs @ 12.97 hrs, Volume= 0.006 af, Atten= 0%, Lag= 0.0 min Routed to nonexistent node TSR Primary outflow = Inflow, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Link SR6: Discharge Point '6' - Site Runoff Inflow Primary Hydrograph Time (hours) 26242220181614121086420Flow (cfs)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=0.741 ac 0.12 cfs 0.12 cfs M3 Roof Runoff (per Dwelling) 1P (2) 10.5' x 6.33' x 3.5' Leaching Facilities (per Dwelling) - Each with (1) Cultec Recharger 330XLHD Unit and stone Routing Diagram for 8807.POST-DEV(ROOF RUNOFF) Prepared by J M O'Reilly & Associates Inc, Printed 8/9/2023 HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Subcat Reach Pond Link 8807.POST-DEV(ROOF RUNOFF) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 2HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 100-year Type III 24-hr Default 24.00 1 7.31 2 Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(ROOF RUNOFF) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 3HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Time span=0.00-28.00 hrs, dt=0.03 hrs, 934 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=1,288 sf 100.00% Impervious Runoff Depth=7.07"Subcatchment M3: Roof Runoff (per Flow Length=20' Slope=0.4000 '/' Tc=6.0 min CN=98 Runoff=0.21 cfs 0.017 af Peak Elev=52.60' Storage=225 cf Inflow=0.21 cfs 0.017 afPond 1P: (2) 10.5' x 6.33' x 3.5' Leaching Outflow=0.03 cfs 0.017 af Total Runoff Area = 0.030 ac Runoff Volume = 0.017 af Average Runoff Depth = 7.07" 0.00% Pervious = 0.000 ac 100.00% Impervious = 0.030 ac Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(ROOF RUNOFF) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 4HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment M3: Roof Runoff (per Dwelling) Runoff = 0.21 cfs @ 12.08 hrs, Volume= 0.017 af, Depth= 7.07" Routed to Pond 1P : (2) 10.5' x 6.33' x 3.5' Leaching Facilities (per Dwelling) - Each with (1) Cultec Recharger 330XLHD Unit and stone Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Type III 24-hr 100-year Rainfall=7.31" Area (sf) CN Description 1,288 98 Roofs, HSG A 1,288 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.1 20 0.4000 3.33 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.25" 0.1 20 Total, Increased to minimum Tc = 6.0 min Subcatchment M3: Roof Runoff (per Dwelling) Runoff Hydrograph Time (hours) 26242220181614121086420Flow (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 100-year Rainfall=7.31" Runoff Area=1,288 sf Runoff Volume=0.017 af Runoff Depth=7.07" Flow Length=20' Slope=0.4000 '/' Tc=6.0 min CN=98 0.21 cfs Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(ROOF RUNOFF) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 5HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: (2) 10.5' x 6.33' x 3.5' Leaching Facilities (per Dwelling) - Each with (1) Cultec Recharger 330XLHD Unit and stone Inflow Area = 0.030 ac,100.00% Impervious, Inflow Depth = 7.07" for 100-year event Inflow = 0.21 cfs @ 12.08 hrs, Volume= 0.017 af Outflow = 0.03 cfs @ 11.67 hrs, Volume= 0.017 af, Atten= 88%, Lag= 0.0 min Discarded = 0.03 cfs @ 11.67 hrs, Volume= 0.017 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-27.99 hrs, dt= 0.03 hrs Peak Elev= 52.60' @ 12.65 hrs Surf.Area= 133 sf Storage= 225 cf Plug-Flow detention time= 52.9 min calculated for 0.017 af (100% of inflow) Center-of-Mass det. time= 52.8 min ( 795.2 - 742.4 ) Volume Invert Avail.Storage Storage Description #1 50.00' 127 cf Cultec R-330XLHD x 2 Inside #2 Effective Size= 47.8"W x 30.0"H => 7.45 sf x 7.00'L = 52.2 cf Overall Size= 52.0"W x 30.5"H x 8.50'L with 1.50' Overlap Row Length Adjustment= +1.50' x 7.45 sf x 2 rows #2 50.00' 155 cf 6.33'W x 10.50'L x 3.54'H Prismatoid x 2 471 cf Overall - 127 cf Embedded = 344 cf x 45.0% Voids 281 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 50.00'8.270 in/hr Exfiltration over Horizontal area Phase-In= 0.01' Discarded OutFlow Max=0.03 cfs @ 11.67 hrs HW=50.04' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.03 cfs) Type III 24-hr 100-year Rainfall=7.31"8807.POST-DEV(ROOF RUNOFF) Printed 8/9/2023Prepared by J M O'Reilly & Associates Inc Page 6HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: (2) 10.5' x 6.33' x 3.5' Leaching Facilities (per Dwelling) - Each with (1) Cultec Recharger 330XLHD Unit and stone Inflow Discarded Hydrograph Time (hours) 26242220181614121086420Flow (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=0.030 ac Peak Elev=52.60' Storage=225 cf 0.21 cfs 0.03 cfs