J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Post Development West Orange A_03 01 12 Printed 3/14/2012 Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Pagg.6 Summary for Subcatchment 3A: PO-DA 3 Runoff = 0.91 cfs@ 12.20 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, Split 0.091 af, Depth= 2.29" Pervious/Imperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description ■k 10,141 10,571 98 Gravel road, HSG D 78 Meadow, non-grazed, HSG D 20,712 10,571 10,141 88 Weighted Average 78 51.04% Pervious Area 98 48.96% Impervious Area Tc (min) Length (feet) Slope Velocity (ft/ft) (ft/sec) 13.8 100 0.0200 0.12 0.5 92 0.0400 3.00 0.2 50 0.0200 4.84 Capacity (cfs) Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 5.94 Pipe Channel, 15.0" Round Area=1.2sf Perim= 3.9' r= 0.31’ n= 0.020 Corrugated PE, corrugated interior 14.5 242 Total Subcatchment 3A: PO-DA 3 Hydrograph lTTIj . -i- l i ■ j l . i. -i. l , -i - i . , l . j ...... . l . 10.91 cfs I« 11...... .... ihi'ii n p nf|‘ii'w [‘mi Type III 24-hr 2 yr i i Rainfall=3.42" Runoff Area=20,712 sf Runoff Volume=0,091 af i Runoff Depth=2.29” Flow Length=242' Tc=14.5 min I CN=78/98 ii mfmtfmtfn 10 11 12 13 14 15 16 17 18 19 20 21 Tims (hours) .... ..... 22 23 24 25 26 27 28 29 30 dt= 0.01 hrs