J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 Type III 24-hr 10 yr Rainfall=5.21" Prepared byTRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 34 Summary for Subcatchment 9B: EX-DA 9B Runoff = 2.74 cfs @ 12.43 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 10 yr Rainfall=5.21" UH=SCS, Split 0.378 af, Depth= 4.32" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= “i—r * r “ r 0.01 Area (sf) CN Description h 24,703 670 20,336 98 Impervious, HSG D 91 Gravel, HSG D 85 Yard stone, HSG D 45,709 21,006 24,703 92 Weighted Average 85 45.96% Pervious Area 98 54.04% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity (ft/ft) (ft/sec) 30.0 150 0.0070 0.08 Sheet Flow, Yard Stone 1.0 160 0.0190 2.80 Shallow Concentrated Flow, 31.0 310 Total ★ * Description (cfs) n= 0.250 P2= 3.42" Paved Kv= 20.3 fps Subcatchment 9B: EX-DA 9B I T l r i n Hydrograph IlIlI r_r-i--|--r 2.74 __• i. _J___ cfs Typeilll 24-*hr 10;yr i Rainfall-5.21 :Runoff Area=45r709 sf Rtunoff Volume=0.378 af : ftunoff bepth=4.32':' Flow Length=3i0' Te|=31>o|niih i ;CN=85/98 ................ .. ....... .. ............... "'i'" " i*" ............... ................p ii i’ ” '!■' 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) • hrs