J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 Type III 24-hr 10yr Rainfall=5.21" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 25 Summary for Subcatchment 2S: EX-DA2 Runoff = 1.00 cfs @ 12.31 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 10 yr Rainfall=5.21" UH=SCS, 0.116af, Depth= 3.38" Split Pervious/Imperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description h h 4,190 10,038 3,705 98 Paved road, HSG D 80 Grass, Good, HSG 73 Brush, Good, HSG D 17,933 13,743 4,190 83 Weighted Average 78 76.64% Pervious Area 98 23.36% Impervious Area Tc (min) Length (feet) 21.8 150 Slope Velocity Capacity (ft/ft) (ft/sec) 0.0400 D Description (cfs) Sheet Flow, 0.11 Woods: Light underbrush n= 0.400 P2= 3.42" 1.1 240 0.0630 22.9 390 Total Shallow Concentrated Flow, 3.76 Grassed Waterway Kv= 15.0 fps Subcatchment 2S: EX-DA2 Hydrograph 1.00 cfs Type III 24-hr 10 yr i Rainfall=5.21" Runoff Area=17,933 sf Runoff; Volume=0.116 af Runoff Depth=3.38" Flow Length=390' 4 I I I I I I I“l i l t Tc=22.9 min CN=7 8/98 1 2 ---- 2 3 4 5 6 7 B 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