J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange A_03 01 12 Type III 24-hr 10 yr Rainfall=5.21" Prepared byTRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 23 Summary for Subcatchment 3B: 3B Runoff = 1.10 cfs @ 12.08 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 10 yr Rainfa!l=5.21" * h UH=SCS, Split 0.087 af, Depth= 4.23” Pervious/lmperv., Area (sf) CN Description 5,785 1,111 3.792 98 98 78 Impervious, HSG D Gravel Road, HSG D Meadow, non-grazed, HSG D 10,688 3,792 6,896 91 78 98 Weighted Average 35.48% Pervious Area 64.52% Impervious Area Tc (min) Length (feet) 1.3 100 0.0150 1.27 0.8 150 0.0400 3.00 2.1 250 Total, Time Span= 0.00-30.00 hrs, Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) Sheet Flow, Smooth surfaces n= 0.011 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Increased to minimum Tc = 6.0 min Subcatchment 3B: 3B --------- - Hydrograph I !I 10 cfs Type III 24-hr 10 yr Rainfall-5.21" Runoff Area=10,688 sf Runoff Volume=0.087 af Runoff Depth=4.23" Flow Length=250' Tc=6.0 min CN=78/98 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) dt= 0.01 hrs