1240815StormWaterManagementReportrcd 3 12 2026

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC 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 Subcatchment 1: Exisiting Runoff Area=16,242 sf 67.90% Impervious Runoff Depth=7.99" Flow Length=141' Tc=5.9 min CN=74/98 Runoff=2.96 cfs 0.248 af Subcatchment 2: Parking Lot Runoff Area=7,658 sf 86.88% Impervious Runoff Depth=8.55" Flow Length=92' Tc=1.0 min CN=74/98 Runoff=1.66 cfs 0.125 af Subcatchment 4: Proposed Runoff Area=7,266 sf 64.56% Impervious Runoff Depth=7.90" Flow Length=92' Tc=1.0 min CN=74/98 Runoff=1.49 cfs 0.110 af Subcatchment 6: Bypass Runoff Area=1,318 sf 0.00% Impervious Runoff Depth=5.99" Flow Length=128' Tc=6.0 min CN=74/0 Runoff=0.20 cfs 0.015 af Pond 3: Pervious Pavers Peak Elev=415.32' Storage=1,177 cf Inflow=1.66 cfs 0.125 af Discarded=0.11 cfs 0.096 af Primary=0.67 cfs 0.029 af Outflow=0.78 cfs 0.125 af Pond 5: Pipes Peak Elev=412.24' Storage=420 cf Inflow=2.07 cfs 0.139 af Discarded=0.03 cfs 0.044 af Primary=1.60 cfs 0.096 af Outflow=1.63 cfs 0.139 af Link 7: Proposed Inflow=1.80 cfs 0.111 af Primary=1.80 cfs 0.111 af Total Runoff Area = 0.746 ac Runoff Volume = 0.499 af Average Runoff Depth = 8.02" 31.13% Pervious = 0.232 ac 68.87% Impervious = 0.514 ac 54