J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange A_03 01 12 Type III 24-hr 100 yr Rainfall=d. 72" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 38 Summary for Subcatchment 3A: PO-DA 3 Runoff = 2.85 cfs @ 12.19 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, 0.287 af, Depth= 7.24" Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * 10,141 10,571 98 Gravel road, HSG D 78 Meadow, non-qrazed, HSG D 20,712 10,571 10,141 88 Weighted Average 78 51.04% Pervious Area 98 48.96% Impervious Area Tc (min) Length (feet) Slope Velocity (ft/ft) (ft/sec) 13.8 100 0.0200 0.12 0.5 92 Capacity (cfs) Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" 0.0400 Shallow Concentrated Flow, 3.00 Grassed Waterway Kv= 15.0 fps 0.2 50 0.0200 4.84 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 -------------------; -------- 1 -------- ; -------- : -------- i - - 4. - !—r Hydrograph ;--- 1 ii ----2.85 cfs - _.L.. L . i .__l__I___ J L _ L _ J - _ ------I ------4 ---------1 - , - 1 ----- I ----- 4 --------- --------I ------W - 4 -------- 1 ----- 1 ----- L I | Type III 24-hr 100 yr i Rainfall=8.72" Runoff Area=20,712 sf Runoff Volume=0,287 af ; Runoff Depth=7.24 ■' i Flow Length=242' _ . L . J . J Tc=14.5 min CN=78/98 _ . L . J _ .1. 'I........................... .mi........... .. ni|‘ii ii |i ii .... min ii |t in7tTTrriwtw^w»pi' 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) dt= 0.01 hrs