J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 Type III 24-hr 100 yr Rainfalhd. 72" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 48 Summary for Subcatchment 7: PO-DA 7 Runoff = 1.141 af, Depth3 6.35" 14.79 cfs@ 12.11 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall38.72" UH=SCS, Split Pervious/lmperv., Time Span3 0.00-30.00 hrs, Area (sf) CN Description * * * 1,868 14,410 72,265 5.406 98 Impervious, HSG D 85 Yard stone, HSG D 80 Grass , Good, HSG 73 Brush, Good, HSG D 93,949 92,081 1,868 81 Weighted Average 80 98.01% Pervious Area 98 1.99% Impervious Area Tc (min) Length (feet) 4.5 70 0.1600 0.26 0.8 70 0.0857 Slope Velocity Capacity (ft/ft) (ft/sec) D Description (cfs) Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, 1.46 Woodland Kv= 5.0 fps 2.4 310 0.0200 2.12 in 450 Total Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Subcatchment 7: PO-DA 7 Hydrograph “I--- i—r 16 . J . 14 79 cfs P7 / / 15 14-: ~—i—i—i—r -1— i— -» —i- — i— + - 13-1 It 12 11-; -4------- i- - R 10- I 9: s 8-: a u. y6 r ~ t —i 5-i 4 Type III 24-hr 100 yr Rainfa!i=8.72M Runoff; Area=93,949 sf tupoff Volume=1.141; af Runoff Depth=6.35" Flow Length=450' Tc=7.7 min CN=80/98 3 2 _ 1-; 0- pirn-M-nTf 1 2 3 4 5 67 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) dt3 0.01 hrs