J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 41 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Pond 17P: SD-23 Inflow Area = 1.305 ac, 24.67% Impervious, Inflow Depth > 0.46" for WQ event Inflow = 0.33 cfs @ 1.76 hrs, Volume= 0.050 af Outflow = 0.33 cfs @ 1.76 hrs, Volume= 0.050 af, Atten= 0%, Lag= 0.1 min Primary = 0.33 cfs @ 1.76 hrs, Volume= 0.050 af Routed to Pond 14P : SD-24 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 587.06' @ 1.76 hrs Surf.Area= 0.000 ac Storage= 0.000 af Plug-Flow detention time= 0.1 min calculated for 0.050 af (100% of inflow) Center-of-Mass det. time= 0.1 min ( 153.5 - 153.5 ) Volume #1 Device #1 Invert 586.80' Avail.Storage 0.003 af Routing Primary Invert 586.80' Storage Description 15.0" Round SD-23 L= 93.7' S= 0.0150 '/' Outlet Devices 15.0" Vert. SD-23 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.33 cfs @ 1.76 hrs HW=587.06' TW=585.17' (Dynamic Tailwater) 1=SD-23 (Orifice Controls 0.33 cfs @ 1.75 fps) Pond 17P: SD-23 Hydrograph 0.36 Inflow Primary 0.33 cfs Inflow Area=1.305 ac Peak Elev=587.06' Storage=0.000 af 0.33 cfs 0.34 0.32 0.3 0.28 0.26 Flow (cfs) 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Time (hours) 15 16 17 18 19 20 21 22 23 24