Stormwater Report

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Casey & Keller, Inc Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Paae 2 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=2.60" Flow Length=141' Tc=5.9 min CN=74/98 Runoff=0.98 cfs 0.081 af Subcatchment2: Parking Lot Runoff Area=7,305 sf 91.47% Impervious Runoff Depth=3.06" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=0.58 cfs 0.043 af Pond 3: Pervious Pavers Peak Elev=414.05' Storage=358 cf Inflow=0.58 cfs 0.043 af Discarded=0.11 cfs 0.043 af Primary=0.00 cfs 0.000 af Outflow=0.11 cfs 0.043 af Subcatchment4: Proposed Runoff Area=8,392 sf 56.22% Impervious Runoff Depth=2.35" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=0.52 cfs 0.038 af Pond 5: Pipes Peak Elev=412.44' Storage=183 cf Inflow=0.52 cfs 0.038 af Discarded=0.03 cfs 0.024 af Primary=0.41 cfs 0.014 af Outflow=0.44 cfs 0.038 af Subcatchmenté6: Bypass Runoff Area=605 sf 0.00% Impervious Runoff Depth=1.22" Flow Length=128' Tc=6.0 min CN=74/0 Runoff=0.02 cfs 0.001 af Link 7: Proposed Inflow=0.43 cfs 0.015 af Primary=0.43 cfs 0.015 af Total Runoff Area = 0.747 ac Runoff Volume = 0.163 af Average Runoff Depth = 2.62" 30.71% Pervious = 0.229 ac 69.29% Impervious = 0.518 ac