J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Current Rainfall=3.45", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 57 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 14S: PO-DA L Runoff = 0.21 cfs @ 12.19 hrs, Volume= Routed to Reach 6R : TD-04 0.019 af, Depth> 1.22" 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 2-Year_Current Rainfall=3.45", P2=3.45" Area (sf) 915 218 6,839 7,972 7,972 * CN 80 85 73 Description >75% Grass cover, Good, HSG D Yard Stone/Gravel Pad, HSG D Brush, Good, HSG D Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.9 100 0.1003 0.15 Sheet Flow, Sheet Flow Woods: Light underbrush n= 0.400 P2= 3.45" 0.2 16 0.0339 1.29 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 11.1 116 Total Subcatchment 14S: PO-DA L Flow (cfs) Hydrograph Runoff 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 0.21 cfs NOAA 24-hr D 2-Year_Current Rainfall=3.45" P2=3.45" Runoff Area=7,972 sf Runoff Volume=0.019 af Runoff Depth>1.22" Flow Length=116' Tc=11.1 min CN=WQ 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