J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Current Rainfall=3.45", P2=3.45" West Orange HydroCAD_Post Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 78 Summary for Pond 20P: SD-11, SD-12 Inflow Area = 1.308 ac, 0.00% Impervious, Inflow Depth > 1.20" for 2-Year_Current event Inflow = 1.44 cfs @ 12.19 hrs, Volume= 0.131 af Outflow = 1.44 cfs @ 12.19 hrs, Volume= 0.130 af, Atten= 0%, Lag= 0.3 min Primary = 1.44 cfs @ 12.19 hrs, Volume= 0.130 af Routed to Pond 7P : O-1A Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 591.54' @ 12.19 hrs Surf.Area= 70 sf Storage= 30 cf Plug-Flow detention time= 1.7 min calculated for 0.130 af (100% of inflow) Center-of-Mass det. time= 0.6 min ( 875.7 - 875.0 ) Volume #1 Invert 600.17' Avail.Storage 8 cf #2 591.00' 277 cf #3 590.26' 83 cf 368 cf Elevation (feet) 590.26 596.63 Device #1 Routing Primary Surf.Area (sq-ft) 13 13 Invert 591.00' Storage Description 12.0" Round SD-11 L= 10.0' S= 0.0100 '/' 18.0" Round SD-12 L= 157.0' S= 0.0100 '/' MH-08 (Existing) (Prismatic)Listed below (Recalc) Total Available Storage Inc.Store (cubic-feet) 0 83 Cum.Store (cubic-feet) 0 83 Outlet Devices 18.0" Vert. SD-12 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=1.44 cfs @ 12.19 hrs HW=591.54' TW=0.00' (Dynamic Tailwater) 1=SD-12 (Orifice Controls 1.44 cfs @ 2.50 fps)