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 151 Summary for Pond 6P: BR-04 Inflow Area = 0.317 ac, 38.48% Impervious, Inflow Depth > 4.12" for 10-Year_Current event Inflow = 1.44 cfs @ 12.12 hrs, Volume= 0.109 af Outflow = 0.20 cfs @ 12.71 hrs, Volume= 0.106 af, Atten= 86%, Lag= 35.1 min Primary = 0.20 cfs @ 12.71 hrs, Volume= 0.106 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= 596.26' @ 12.71 hrs Surf.Area= 5,788 sf Storage= 1,813 cf Plug-Flow detention time= 115.9 min calculated for 0.106 af (97% of inflow) Center-of-Mass det. time= 99.3 min ( 882.6 - 783.3 ) Volume #1 #2 Invert 596.70' 596.20' Avail.Storage 5,428 cf 543 cf #3 594.70' 1,727 cf #4 594.70' 24 cf 7,721 cf Storage Description Filter Media Layer (Prismatic)Listed below (Recalc) Sand Layer (Prismatic)Listed below (Recalc) 1,447 cf Overall x 37.5% Voids Gravel Layer (Prismatic)Listed below (Recalc) 4,341 cf Overall - 24 cf Embedded = 4,317 cf x 40.0% Voids 4.0" Round 4" Underdrain Pipe Inside #3 L= 271.7' S= 0.0001 '/' Total Available Storage Elevation (feet) 596.70 598.20 599.75 Surf.Area Voids (sq-ft) (%) 2,894 0.0 2,894 21.7 2,894 100.0 Elevation (feet) 596.20 596.70 Surf.Area (sq-ft) 2,894 2,894 Inc.Store (cubic-feet) 0 1,447 Cum.Store (cubic-feet) 0 1,447 Elevation (feet) 594.70 596.20 Surf.Area (sq-ft) 2,894 2,894 Inc.Store (cubic-feet) 0 4,341 Cum.Store (cubic-feet) 0 4,341 Device #1 Routing Primary Invert 586.53' #2 Device 1 594.70' #3 Device 1 598.30' #4 Device 1 599.65' Inc.Store (cubic-feet) 0 942 4,486 Cum.Store (cubic-feet) 0 942 5,428 Outlet Devices 15.0" Vert. SD-24 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