J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 13 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 9S: PO-DA G Runoff = 0.31 cfs @ Routed to Pond 3P : BR-03 1.33 hrs, Volume= 0.016 af, Depth= 0.49" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" Area (sf) 4,879 2,788 9,235 16,902 12,023 4,879 * CN 98 80 85 Description Impervious, Pavement, HSG D >75% Grass cover, Good, HSG D Yard Stone/Gravel Pad, HSG D Weighted Average 71.13% Pervious Area 28.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 22.7 100 0.0010 0.07 Sheet Flow, Gravel Sheet Flow n= 0.100 P2= 3.42" 0.7 75 0.0121 1.77 Shallow Concentrated Flow, Shallow Concentrated Flow Unpaved Kv= 16.1 fps 23.4 175 Total Subcatchment 9S: PO-DA G Hydrograph Runoff 0.34 0.31 cfs 0.32 NJ DEP 2-hr WQ Rainfall=1.25" P2=3.42" Runoff Area=16,902 sf Runoff Volume=0.016 af Runoff Depth=0.49" Flow Length=175' Tc=23.4 min CN=WQ 0.3 0.28 0.26 0.24 Flow (cfs) 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Time (hours) 15 16 17 18 19 20 21 22 23 24