250701_42 ERW_Stormwater Report

NJ DEP 2-hr WQ Rainfall=1.25" 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 20 Summary for Subcatchment PR 2-P: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.04 cfs @ Routed to Reach DP2-PR : 1.16 hrs, Volume= 0.001 af, Depth= 0.10" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NJ DEP 2-hr WQ Rainfall=1.25" Area (sf) 6,447 958 7,405 7,405 CN 74 89 76 Description >75% Grass cover, Good, HSG C Gravel roads, HSG C Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.6 84 0.0833 0.30 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" Subcatchment PR 2-P: Flow (cfs) Hydrograph 0.046 0.044 0.04 cfs 0.042 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 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=7,405 sf Runoff Volume=0.001 af Runoff Depth=0.10" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 Runoff