J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 Type III 24-hr 100 yr Rainfall=8.72" Prepared by TRC Engineers, Inc. Printed 3/14/2012 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 51 Summary for Subcatchment 9D: PO-DA 9D Runoff = 7.85 cfs @ 12.19 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, 0.782 af, Depth= 7.40" Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= Area (sf) CN Description * * ★ 1,192 16,177 37,810 98 Impervious, HSG D 98 Gravel road, HSG D 85 Yard Stone, HSG D 55,179 37,810 17,369 89 Weighted Average 85 68.52% Pervious Area 98 31.48% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity (ft/ft) (ft/sec) 12.6 100 0.0270 0.13 0.8 120 0.0270 2.65 Shallow Concentrated Flow, Yard Stone 1.1 130 0.0140 1.90 Shallow Concentrated Flow, Yard Stone Description (cfs) Sheet Flow, Yard Stone n= 0.250 P2= 3.42" Unpaved Kv= 16.1 fps Un paved Kv= 16.1 fps 14.5 350 Total Subcatchment 9D: PO-DA 9D Hydrograph 1------- 1----- 1 1 i • i i i i t 7.85 CTS > i ------ 1------!------1------ !------ !------ !------1------ !------ 1------1----- 1------1----- !-----i 1 l l t 1 : 1 i i ' t i ' ' 1 ! 1 1 1 1 r 1 l , 111111!11|!1 i—i—■—!— 5“ I------- T----------1-------1- ■ r - t--------- 1- : Rainfall=8.72" Runoff Area=55,179 sf Runoff Volume=0.782af Runoff Depth=7.40" Flow Length=350' Tc=14.5 min CN=85/98 i- 12 34 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) 0.01 hrs