J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 Type III 24-hr 100 yr Rainfall=8.72" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 49 Summary for Subcatchment 5S: EX-DA 5 Runoff = 3.89 cfs @ 12.08 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, 0.317 af, Depth= 8.19" Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * * 17,517 2,694 98 Paved road, HSG D 80 Grass cover, Good, HSG D 20,211 2,694 17,517 96 Weighted Average 80 13.33% Pervious Area 98 86.67% Impervious Area Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity (cfs) Description 0.8 100 0.0570 2.16 Sheet Flow, 0.4 120 0.0790 5.71 Shallow Concentrated Flow, 0.3 50 0.0250 3.21 Shallow Concentrated Flow, 0.3 55 0.0320 3.63 Shallow Concentrated Flow, Smooth surfaces n= 0.011 P2= 3.42" Paved Kv= 20.3 fps Paved Kv= 20.3 fps Paved Kv= 20.3 fps 1.8 325 Total, Increased to minimum Tc = 6.0 min Subcatchment 5S: EX-DA 5 Hydrograph 9cfs I': : -ram---------r r-r-i 22 : Type III 24-hr 100 yr i Rainfall=8.72" Runoff ii ii ii i i # i i i i Area=20,211 sf Runoff Volume=0.317 af Runoff Depth=8.1,9 Flow Length=325' : Tc=6.0 min CN=80/98 0- 01 2 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) dt= 0.01 hrs