J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 Prepared byTRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Type III 24-hr 10 yr Rainfall=5.21" Printed 3/4/2012 Page 32 Summary for Subcatchment 8S: EX-DA 8 Runoff = 2.79 cfs @ 12.38 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 10 yr Rainfall=5.21” UH=SCS, 0.361 af, Depth= 4.04" Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Area (sf) CN Description * * * 15,912 29,261 1,535 98 Impervious, HSG D 85 Yard stone, HSG D 80 Grass, Good, HSG D 46,708 30,796 15,912 89 Weighted Average 85 65.93% Pervious Area 98 34.07% Impervious Area Tc (min) Length (feet) 25.5 80 0.0030 0.05 Sheet Flow, Yard stone 0.5 80 0.0170 2.65 Shallow Concentrated Flow, 2.2 165 0.0060 1.25 Shallow Concentrated Flow, Yard Stone 0.2 60 0.0580 4.89 Shallow Concentrated Flow, 28.4 385 Total Slope Velocity (ft/ft) (ft/sec) Capacity (cfs) Description n= 0.250 P2= 3.42" Paved Kv= 20.3 fps Unpaved Kv= 16.1 fps Paved Kv= 20.3 fps Subcatchment 8S: EX-DA 8 Hydrograph - J. - -J t—i—i—r ---- 1 -- L J--- 1------ 1 ------I ----------I -------1 ------I ____ L _ J ________ I ____L i i . J ------------------- l _ _ L _ J ______ 1 ___ I ____ L _ J _______ __I__ L _ :_l 2.79 T ~ 7 • ---- I cfs rrn R -*1- 01 - - k- Type III 54thr 10;yr j i Rainfall=5.21';' Ruhdff| Araa-46,708; sf unoff;Volume=0.;361;af Runoff depth=4.Q4l' Flow Length=385' Tc=28.4n1irt ! CN=85/98 frrrri p u iiini p'n ipi »i p i i n*n i i................... n ■ ■ i n ■ ■ ................................... ................... 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) *5