complete drainage report rev 9

NJ DEP 2-hr WQ Rainfall=1.25" Combined FT (8-22-24) Prepared by Contech Engineered Solutions HydroCAD® 10.20-3f s/n 00447 © 2023 HydroCAD Software Solutions LLC Printed 8/26/2024 Page 31 Summary for Subcatchment 21p: Perv Runoff = 0.00 cfs @ 1.09 hrs, Volume= Routed to Pond 21FT : 6x4 FT 4 cf, Depth= 0.17" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NJ DEP 2-hr WQ Rainfall=1.25" Area (sf) 270 270 Tc (min) 0.8 Length (feet) 100 0.5 153 1.3 253 CN 80 Description >75% Grass cover, Good, HSG D 100.00% Pervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0500 2.07 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 0.0530 4.67 Shallow Concentrated Flow, Paved Kv= 20.3 fps Total Subcatchment 21p: Perv Flow (cfs) Hydrograph 0.005 0.005 0.00 cfs 0.005 0.004 0.004 0.004 0.004 0.004 0.003 0.003 0.003 0.003 0.003 0.002 0.002 0.002 0.002 0.002 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0 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) NJ DEP 2-hr WQ Rainfall=1.25" Runoff Area=270 sf Runoff Volume=4 cf Runoff Depth=0.17" Flow Length=253' Tc=1.3 min CN=80 Runoff