09 Stormwater Mgmt Report 122025

NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" NJA230139 - REV 2 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Printed 12/11/2025 Page 12 Summary for Pond PP1: Pervious Pavement Inflow Area = 11,761 sf,100.00% Impervious, Inflow Depth = 3.24" for 2-Year-Current event Inflow = 0.77 cfs @ 12.04 hrs, Volume= 3,172 cf Outflow = 0.54 cfs @ 12.15 hrs, Volume= 2,148 cf, Atten= 30%, Lag= 6.5 min Primary = 0.54 cfs @ 12.15 hrs, Volume= 2,148 cf Routed to Link P1 : PDA 1A Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.10 hrs / 9 Peak Elev= 367.07' @ 12.15 hrs Surf.Area= 8,538 sf Storage= 1,436 cf Plug-Flow detention time= 224.1 min calculated for 2,145 cf (68% of inflow) Center-of-Mass det. time= 118.6 min ( 870.0 - 751.4 ) Volume #1 Invert 366.65' Elevation (feet) 366.65 367.65 Avail.Storage 3,415 cf Surf.Area (sq-ft) 8,538 8,538 Device #1 Routing Primary Invert 365.50' #2 Device 1 366.95' Storage Description Custom Stage Data (Prismatic)Listed below (Recalc) 8,538 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 8,538 Cum.Store (cubic-feet) 0 8,538 Outlet Devices 15.0" Round RCP_Round 15" L= 273.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 365.50' / 364.15' S= 0.0049 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 1.23 sf 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=0.52 cfs @ 12.15 hrs HW=367.07' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 0.52 cfs of 5.70 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Weir Controls 0.52 cfs @ 1.12 fps)