Stormwater Report

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 100-Year-2020 Rainfall=9. 18", P2=3.47" Prepared by Casey & Keller, Inc Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 28 Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. UI as Pervious Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1: Exisiting Runoff Area=16,242 sf 68.64% Impervious Runoff Depth=8.02" Flow Length=141' Tc=5.9 min CN=74/98 Runoff=2.97 cfs 0.249 af Subcatchment2: Parking Lot Runoff Area=7,305 sf 91.47% Impervious Runoff Depth=8.69" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=1.59 cfs 0.121 af Pond 3: Pervious Pavers Peak Elev=415.26' Storage=1,140 cf Inflow= Discarded=0.11 cfs 0.094 af Primary=0.64 cfs 0.027 af Outflow= 1.59 cfs 0.121 af .75 cfs 0.121 af Subcatchment4: Proposed Runoff Area=8,392 sf 56.22% Impervious Runoff Depth=7.65" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=1.69 cfs 0.123 af Pond 5: Pipes Peak Elev=414.09' Storage=641 cf Inflow=2.21 cfs 0.150 af Discarded=0.03 cfs 0.045 af Primary=1.83 cfs 0.105 af Outflow=1.86 cfs 0.150 af Subcatchment6: Bypass Runoff Area=605 sf 0.00% Impervious Runoff Depth=5.99" Flow Length=128' Tc=6.0 min CN=74/0 Runoff=0.09 cfs 0.007 af Link 7: Proposed Inflow=1.92 cfs 0.112 af Primary=1.92 cfs 0.112 af Total Runoff Area = 0.747 ac Runoff Volume = 0.500 af Average Runoff Depth = 8.03" 30.71% Pervious = 0.229 ac 69.29% Impervious = 0.518 ac 35