J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 Type III 24-hr 2 yr Rainfall=3.42" Printed 3/4/2012 Page 6 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 sIn 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: EX-DA 4 Runoff = 3.82 cfs @ 12.19 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, 0.374 af, Depth= 2.48" Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 Area (sf) CN Description * * * * * 31,370 5,072 12,803 8,134 21.568 98 Paved road, HSG D 98 Gravel road, HSG D 91 Gravel, HSG D 85 Yard stone, HSG D 80 Grass, Good, HSG D 78,947 42,505 36,442 91 Weighted Average 84 53.84% Pervious Area 98 46.16% Impervious Area Tc (min) Length (feet) 12.3 150 0.0600 0.20 0.7 135 0.0460 3.22 Shallow Concentrated Flow, 1.2 310 0.0470 4.40 Shallow Concentrated Flow, Slope Velocity Capacity (ft/ft) (ft/sec) Description (cfs) Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Grassed Waterway Kv= 15.0 fps Paved Kv= 20.3 fps 14.2 595 Total Subcatchment 4S: EX-DA 4 Hydrograph ---------1 ---- 1 ------ 1 ----- 1 ----- 1 ----- 1 1 ■ • i i i i i i 1 ' - 1 L J - 1 1 1 1 1 1 O QQ _r_ i i i i t i CIS O.OdC. i i i i i i i i jH i i i i i i i i 1 —i—i—i—i—i—r' i t i—i—i—;—i—i—i—i—i— i i i i i i i i 1 ■ ■ - 1 1 1 1 I 1 1 i i i i • i i __1_J i i i i ' _ ________ O2 ____________ t_ __ _.L i 1 i i 1 i i i i i i i i i 1 i 1 i 1 i 1 i 1 i 1 i 1 i 1 i Type III 24-hr; 2 yr Rainfall=3.42,> unoff Area=78,947 sf noff Volume=0.:374 af Runoff Depth-2.48? Flow Length^SS' Tc=14.2min : :CN=84/98 > ^ i i ----- i : - .... 111 |«I ■ 111111‘1111HI ■ ■ I-11111«11111‘11111‘1111I ■ 11‘11111111‘1111 )< I 0 1 2 3 4 56 78 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