J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Type III 24-hr 100 yr Rainfall=8.72" Printed 3/14/2012 Page 49 Summary for Subcatchment 8: PO-DA 8 Runoff = 1.73 cfs@ 12.43 hrs, Vo!ume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, Split 0.247 af, Depth= 7.97" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * * 10,980 5.243 98 Impervious, HSG D 85 Yard stone, HSG D 16,223 5,243 10,980 94 Weighted Average 85 32.32% Pervious Area 98 67.68% Impervious Area Slope Velocity Capacity (ft/ft) (ft/sec) Description Tc (min) Length (feet) 30.5 100 0.0030 0.05 Sheet Flow, Yard Stone 1.2 80 0.0030 1.11 Shallow Concentrated Flow, 31.7 180 Total (cfs) n= 0.250 P2= 3.42" Paved Kv= 20.3 fps Subcatchment 8: PO-DA 8 Hydrograph 1.73 cfs Type III 24-hr 100 yr Rainfall=8.72" Runoff Area=16,223 sf Runoff Volume=0.247 af Runoff Depth-7.97" Flow Length=180' | Slope=0.0030T Tc=31.7 min CN=85/98 — i- mpA 8 jfD i) nielli i1^ it 1111 ii i'u 11 i*i i ■ 111111 |i i j n‘i M' n i1 ‘i p ‘i u'*1 9 10 11 12 13 14 15 18 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) dt= 0.01 hrs