J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 211 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: PO-DA K Runoff = 0.59 cfs @ 12.22 hrs, Volume= Routed to Pond 7P : O-1A 0.059 af, Depth> 7.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" Area (sf) 1,350 1,133 1,917 4,400 3,050 1,350 CN 98 80 73 Description Impervious, Pavement, HSG D >75% Grass cover, Good, HSG D Brush, Good, HSG D Weighted Average 69.32% Pervious Area 30.68% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.0 100 0.0772 0.14 Sheet Flow, Woodland Sheet Flow Woods: Light underbrush n= 0.400 P2= 3.45" 2.3 139 0.0424 1.03 Shallow Concentrated Flow, Shallow Concentrated Flow Woodland Kv= 5.0 fps 14.3 239 Total Subcatchment 13S: PO-DA K Hydrograph 0.65 Runoff 0.59 cfs 0.6 NOAA 24-hr D 100-Year_Current Rainfall=9.23" P2=3.45" Runoff Area=4,400 sf Runoff Volume=0.059 af Runoff Depth>7.06" Flow Length=239' Tc=14.3 min CN=WQ 0.55 0.5 0.45 Flow (cfs) 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 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