21 Stormwater Mgmt Report_082025

NOAA 24-hr D 10-Year-Future Rainfall=6.37", P2=4.09" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 21 Summary for Subcatchment P1p: Proposed Pervious Runoff = 0.02 cfs @ 12.25 hrs, Volume= Routed to Link P1 : PDA 1A 182 cf, Depth= 0.56" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.10 hrs NOAA 24-hr D 10-Year-Future Rainfall=6.37", P2=4.09" Area (ac) 0.090 0.090 CN 39 39 Tc Length (min) (feet) 5.3 85 Description >75% Grass cover, Good, HSG A 100.00% Pervious Area Slope (ft/ft) 0.0500 Velocity (ft/sec) 0.27 0.2 15 0.0400 1.40 0.5 121 0.0400 4.06 2.0 287 0.0140 2.40 0.1 20 0.6600 4.06 8.1 528 Total Capacity (cfs) Description Sheet Flow, Grass: Short n= 0.150 P2= 4.09" Sheet Flow, Smooth surfaces n= 0.011 P2= 4.09" Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Woodland Kv= 5.0 fps Subcatchment P1p: Proposed Pervious Flow (cfs) Hydrograph 0.021 0.02 0.019 0.018 0.017 0.016 0.015 0.014 0.013 0.012 0.011 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0 Runoff 0.02 cfs NOAA 24-hr D 10-Year-Future Rainfall=6.37" P2=4.09" Runoff Area=0.090 ac Runoff Volume=182 cf Runoff Depth=0.56" Flow Length=528' Tc=8.1 min CN=39/0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)