J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 145 Summary for Pond 3P: BR-03 Inflow Area = 0.388 ac, 28.87% Impervious, Inflow Depth > 4.02" for 10-Year_Current event Inflow = 1.05 cfs @ 12.33 hrs, Volume= 0.130 af Outflow = 0.26 cfs @ 13.01 hrs, Volume= 0.127 af, Atten= 75%, Lag= 41.2 min Primary = 0.26 cfs @ 13.01 hrs, Volume= 0.127 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= 596.66' @ 13.01 hrs Surf.Area= 6,525 sf Storage= 2,048 cf Plug-Flow detention time= 99.0 min calculated for 0.127 af (98% of inflow) Center-of-Mass det. time= 87.1 min ( 890.4 - 803.4 ) 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