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 4 Summary for Subcatchment 2i: Imp Runoff = 0.09 cfs @ 1.10 hrs, Volume= Routed to Pond 2FT : 4x4 FT 114 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) 1,325 1,325 Tc (min) 5.3 Length (feet) 100 0.1 35 5.4 135 CN 98 Description Paved parking, HSG D 100.00% Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0850 0.32 Sheet Flow, Grass: Short n= 0.150 P2= 3.47" 0.0860 4.72 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps Total Subcatchment 2i: Imp Hydrograph 0.1 Runoff 0.095 0.09 cfs NJ DEP 2-hr WQ Rainfall=1.25" Runoff Area=1,325 sf Runoff Volume=114 cf Runoff Depth=1.03" Flow Length=135' Tc=5.4 min CN=98 0.09 0.085 0.08 0.075 Flow (cfs) 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 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)