J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 10 yr Rainfall=5.21" Post Development West Orange C_03 01 12 Printed 3/14/2012 Page 29 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 9B: PO-DA 9B 0.324 af, Depth= 3.95” 2.84 cfs @ 12.29 hrs, Volume= Runoff = Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Type III 24-hr 10 yr Rainfall=5.21" Area (sf) CN Description 5,504 98 Impervious, HSG D 6,361 98 Gravel road, HSG D 30,963 85 Yard stone, HSG D 89 Weighted Average 42,828 72.30% Pervious Area 85 30,963 11,865 27.70% Impervious Area 98 * * * Tc (min) 19.6 Length (feet) 100 1.9 150 0.0066 21.5 250 Total Description Slope Velocity Capacity (cfs) (ft/ft) (ft/sec) 0.08 0.0090 Sheet Flow, Yard Stone n= 0.250 P2= 3.42" Shallow Concentrated Flow, Yard Stone Un paved Kv= 16.1 fps 1.31 Subcatchment 9B: PO-DA 9B Hydrograph Runoff 2.84 cfs Type III 24-hr 10 yr Rainfall=5.21" Runoff Area=42,828 sf Runoff volume=0.324 af ao, Runoff Depth=3.d5" o Flow Length=250' LL i.j L- Tc=21.5 mm CN=85/98 m l | M I ) I'll ll|l II H'll II [1 IU| 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)