J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Printed 3/4/2012 Page 7 HydroCAD® 9.10 sIn 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: EX-DA 5 Runoff = 1.45 cfs@ 12.08 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, 0.115 af, Depth= 2.97" 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 Velocity (ft/ft) (ft/sec) Description 0.8 100 0.0570 2.16 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, Capacity (cfs) Sheet 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 i 1 i i i t i i i l i i i i 1.45 cfs : : : ,::: ■i . i ■ • • i i i t • i i i i . i i i i i t i i i .i i i i i i i i i i i i i i i i i i i i i i i i t i i i i Type III 24-hr 2; yr ! Rainfall=3.42" Runoff Area~20,211: sf Runoff Volume=0.;115 af Runoff Depth=2.97" Flow Length=325' c=6.0 min CN=80/98 m 8 i i i i 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