J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 273 Summary for Pond 20P: SD-11, SD-12 Inflow Area = 1.308 ac, 0.00% Impervious, Inflow Depth > 8.20" for 100-Year_Future event Inflow = 9.74 cfs @ 12.17 hrs, Volume= 0.894 af Outflow = 9.69 cfs @ 12.18 hrs, Volume= 0.894 af, Atten= 1%, Lag= 0.7 min Primary = 9.69 cfs @ 12.18 hrs, Volume= 0.894 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= 593.05' @ 12.18 hrs Surf.Area= 141 sf Storage= 256 cf Plug-Flow detention time= 0.6 min calculated for 0.894 af (100% of inflow) Center-of-Mass det. time= 0.4 min ( 812.5 - 812.1 ) 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=9.68 cfs @ 12.18 hrs HW=593.04' TW=0.00' (Dynamic Tailwater) 1=SD-12 (Orifice Controls 9.68 cfs @ 5.48 fps)