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 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 25 Summary for Pond 3P: BR-03 Inflow Area = 0.388 ac, 28.87% Impervious, Inflow Depth = 0.49" for WQ event Inflow = 0.31 cfs @ 1.33 hrs, Volume= 0.016 af Outflow = 0.10 cfs @ 1.87 hrs, Volume= 0.016 af, Atten= 69%, Lag= 32.4 min Primary = 0.10 cfs @ 1.87 hrs, Volume= 0.016 af Routed to Pond 17P : SD-23 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 594.44' @ 1.87 hrs Surf.Area= 2,175 sf Storage= 405 cf Plug-Flow detention time= 78.2 min calculated for 0.016 af (99% of inflow) Center-of-Mass det. time= 78.2 min ( 168.5 - 90.3 ) Volume #1 #2 Invert 596.00' 595.50' Avail.Storage 8,864 cf 408 cf #3 594.00' 1,305 cf #4 594.00' 22 cf 10,599 cf Storage Description Filter Media Layer (Prismatic)Listed below (Recalc) Sand Layer (Prismatic)Listed below (Recalc) 1,088 cf Overall x 37.5% Voids Gravel Layer (Prismatic)Listed below (Recalc) 3,263 cf Overall x 40.0% Voids 4.0" Round Pipe Storage L= 254.1' S= 0.0001 '/' Total Available Storage Elevation (feet) 596.00 597.50 601.25 Surf.Area Voids (sq-ft) (%) 2,175 0.0 2,175 21.7 2,175 100.0 Elevation (feet) 595.50 596.00 Surf.Area (sq-ft) 2,175 2,175 Inc.Store (cubic-feet) 0 1,088 Cum.Store (cubic-feet) 0 1,088 Elevation (feet) 594.00 595.50 Surf.Area (sq-ft) 2,175 2,175 Inc.Store (cubic-feet) 0 3,263 Cum.Store (cubic-feet) 0 3,263 Device #1 Routing Primary Invert 588.19' #2 Device 1 594.00' #3 Device 1 598.50' #4 Device 1 601.15' Inc.Store (cubic-feet) 0 708 8,156 Cum.Store (cubic-feet) 0 708 8,864 Outlet Devices 15.0" Vert. SD-23 Outlet (Elevation F) C= 0.600 Limited to weir flow at low heads 2.5" Vert. Water Quatity (Elevation G) C= 0.600 Limited to weir flow at low heads 2.5" W x 2.5" H Vert. Water Quantity (Elevation H) C= 0.600 Limited to weir flow at low heads 48.0" x 48.0" Horiz. Overflow Grate (Elevation I) C= 0.600 Limited to weir flow at low heads