J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange A_03 01 12 Type III 24-hr 10 yr Rainfall=5.21" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 22 Summary for Subcatchment 3A: PO-DA 3 Runoff = 1.55 cfs @ 12.19 hrs, Volume= Runoff by SCS TR-20 method, UH=SCS, Split Type III 24-hr 10 yr Rainfall=5.21" 0.155 af, Depth= 3.91" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Area (sf) CN Description * 10,141 10.571 98 Gravel road, HSG D 78 Meadow, non-grazed, 20,712 10,571 10,141 88 Weighted Average 78 51.04% Pervious Area 98 48.96% Impervious Area Tc (min) Length (feet) 13.8 100 0.0200 0.12 0.5 92 0.0400 3.00 0.2 50 0.0200 4.84 Slope Velocity (ft/ft) (ft/sec) HSG D Capacity (cfs) Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 5.94 Pipe Channel, 15.0" Round Area=1.2sf Perim= 3.9’ r= 0.31’ n= 0.020 Corrugated PE. corrugated interior 14.5 242 Total Subcatchment 3A: PO-DA 3 Hydrograph ;\ ---- i 1.55 cfs Type III 24-hr 10 yr Rainfall=5.21" Runoff Area=20,712 sf Runoff Volume=0.155 af Runoff Depth=3.91';' Flow Length=242' Tc=14.5mih CN=78/98 -1 rn-rp 10 11 12 13 14 15 18 17 18 19 20 21 22 23 24 25 28 27 28 29 30 Tima (hours)