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 8 Summary for Subcatchment 4i: Imp Runoff = 0.51 cfs @ 1.08 hrs, Volume= Routed to Pond 4FT : 12x6 FT 621 cf, Depth= 1.03" 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) 7,201 7,201 Tc (min) 1.2 Length (feet) 100 0.3 90 1.5 190 CN 98 Description Paved parking, HSG D 100.00% Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0170 1.34 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 0.0510 4.58 Shallow Concentrated Flow, Paved Kv= 20.3 fps Total Subcatchment 4i: Imp Hydrograph Runoff 0.55 0.51 cfs NJ DEP 2-hr WQ Rainfall=1.25" Runoff Area=7,201 sf Runoff Volume=621 cf Runoff Depth=1.03" Flow Length=190' Tc=1.5 min CN=98 0.5 0.45 0.4 Flow (cfs) 0.35 0.3 0.25 0.2 0.15 0.1 0.05 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)