J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Type III 24-hr 100 yr Rainfall=8.72" Printed 3/4/2012 Page 45 HvdroCAD® 9.10 s/n 06401 © 2009 HvdroCAD Software Solutions LLC Summary for Subcatchment 1S: EX-DA 1 Runoff = 9.29 cfs @ 12.24 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, Split 0.974 af, Depth= 6.42" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * * 11,158 661 53,293 14,189 98 98 79 73 Paved road, HSG D Gravel road, HSG D Woods/grass comb., Good, HSG D Brush, Good, HSG D 79,301 67,482 11,819 81 78 98 Weighted Average 85.10% Pervious Area 14.90% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 16.9 150 0.0270 0.15 1.3 270 0.0520 3.42 18.2 420 Total Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Subcatchment 1S: EX-DA 1 Hydrograph . i r ----------------------- ; . . 1 , J ___ _____________ » 9.29 cfs ---ns— — 6J 5- _.L,. .J Type III 24-hr 100 yr : : : Rainfall=8.72" Runoff Area=79,301 sf Runoff Volume=0.974 af ; Runoff Depth=6.42" i Flow Length=420' Tc-18.2 min _ 1 . -I _ -I- _ L _ J _ . L _ _ J _ _ L _ J _ J i CN=78/98 L if 01 2 3 45 67 8 r i I 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 - i - *• dt= 0.01 hrs