J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 Type III 24-hr 2 yr Rainfall-3.42" Printed 3/4/2012 Page 4 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: EX-DA2 Runoff = 0.54 cfs @ 12.32 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, 0.063 af, Depth= 1.85" Split Pervious/Imperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description ★ * 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 -I- - i— - H - -J--:-- l_ 0.54 cfs J _ _ I _L _ J _____ I ___ l _ _ l ____ J ______ l _ _l_ - —i — i— r - -t —i — i— i— t —i—i— r L I j- -type Ml 24-hr:2;yr Rainfall=3.42" t- RUrioff Area=17,933 sf • i i i i i i i i i 'i i i i 1 — i— r RunQff;V6lume=0.063: af i-rtunoff Depth=1;.85r J___ I___I___ i_____ • _ _L . Flow Length=390' Tc=22.9|mln -f CN=?8/9$ J —I------ I— I ____ I ___ L . J_____ l___ L _ i______l_ _ i___ I____ I___ •___l_ _ L ____I ____t ____L - J ________ l _ 0 1 2 34 5 . 87 l. _ L _ J ______ I ___ • ___ I 8 .L . J ----------1 ----- I - _ i . ____I _ _l_ _ U _ J _____ l _ _ l 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