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 by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 20 Summary for Subcatchment 1B: 1B Runoff = 0.74 cfs @ 12.09 hrs, Volume= 0.054 af, Depth= 3.32" Runoff by SCS TR-20 method, UH=SCS, Split Type III 24-hr 10 yr Rainfall=5.21" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Area (sf) CN Description * 1,769 6.795 98 Impervious, HSG D 78 Meadow, non-grazed, 8,564 6,795 1,769 82 Weighted Average 78 79.34% Pervious Area 98 20.66% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity (ft/ft) (ft/sec) 2.4 40 0.2500 HSG D Description (cfs) Sheet Flow, 0.28 Grass: Dense n= 0.240 P2= 3.42" 0.3 55 0.0360 Shallow Concentrated Flow, 2.85 Grassed Waterway Kv=15.0fps 2.7 95 Total, Increased to minimum Tc = 6.0 min Subcatchment 1B: 1B Hydrograph 0.8- __L __L 0,70.65-: L_L _ 0 60.550.5■S 0.450.40.35- . L __L_i_ 0.74 cfs '"•ki 0.75- Jj . ___ ________________________i. . J - - -j-+■-jTypGriiir 2l44hr t°fyr i..l.i J.i..L Jp. Rainfall=5.21" ✓ Runpff Area=8,564 sf Runoff Volume=0.054 af ; i Runoff Depth=3.32" r i r Flow Length=95' . J . J. . L . 1 .J . J. . L - 1 . J . J. . L . I . J . _ J - _ 0.30.25- 0.2- --L_1 0.15- r i r i : GN=78/98 1-J L _ J --7-n 0.1 7 I. I 0.05-: 234 567 — ^----- •- — I--- ^ — 8 9 10 11 12 13 14 15 18 17 18 19 20 21 22 23 24 25 28 27 28 29 30 Time (hours)