1240815StormWaterManagementReportrcd 3 12 2026

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 25-Year-2020 Rainfall=6.72", 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=5.62" Flow Length=141' Tc=5.9 min CN=74/98 Runoff=2.10 cfs 0.175 af Subcatchment 2: Parking Lot Runoff Area=7,658 sf 86.88% Impervious Runoff Depth=6.13" Flow Length=92' Tc=1.0 min CN=74/98 Runoff=1.20 cfs 0.090 af Subcatchment 4: Proposed Runoff Area=7,266 sf 64.56% Impervious Runoff Depth=5.53" Flow Length=92' Tc=1.0 min CN=74/98 Runoff=1.05 cfs 0.077 af Subcatchment 6: Bypass Runoff Area=1,318 sf 0.00% Impervious Runoff Depth=3.80" Flow Length=128' Tc=6.0 min CN=74/0 Runoff=0.13 cfs 0.010 af Pond 3: Pervious Pavers Peak Elev=414.86' Storage=879 cf Inflow=1.20 cfs 0.090 af Discarded=0.11 cfs 0.078 af Primary=0.30 cfs 0.011 af Outflow=0.41 cfs 0.090 af Pond 5: Pipes Peak Elev=411.66' Storage=245 cf Inflow=1.11 cfs 0.088 af Discarded=0.03 cfs 0.037 af Primary=0.96 cfs 0.052 af Outflow=0.99 cfs 0.088 af Link 7: Proposed Inflow=1.09 cfs 0.061 af Primary=1.09 cfs 0.061 af Total Runoff Area = 0.746 ac Runoff Volume = 0.351 af Average Runoff Depth = 5.65" 31.13% Pervious = 0.232 ac 68.87% Impervious = 0.514 ac 41