J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 Type III 24-hr 10 yr Rainfall=5.21" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 28 Summary for Subcatchment 8: PO-DA 8 Runoff = 0.99 cfs @ 12.43 hrs, Volume= 0.140 af, Depth= 4.52" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Type III 24-hr 10 yr Rainfall=5.21" * * Area (sf) CN Description 10,980 98 Impervious, HSG D 5,243 85 Yard stone, HSG D 16,223 94 Weighted Average 5,243 85 32.32% Pervious Area 10,980 98 67.68% Impervious Area Tc (min) 30.5 Length (feet) 100 1.2 80 0.0030 31.7 180 Total Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0030 0.05 1.11 Description Sheet Flow, Yard Stone n= 0.250 P2= 3.42" Shallow Concentrated Flow, Paved Kv= 20.3 fps Subcatchment 8: PO-DA 8 Hydrograph r - -r T “ 99 cfs | ri — r-i Typelll 24^hM0|yr Rainfall=5.21" ii Runoff Area=16,223 R uhoff;Volutne=0.;140; af Runoff Depth=4.52" Flow Length=180' ;i Slope=0.003Q ’/' Tc=31.7 min ; ;CN=85/98 mmmz 5678 sf 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) r