1240815StormWaterManagementReport

PLEASANT VALLEY WAY 1240815-pipes NOAA 24-hr D 10-Year-2020 Rainfall=5.38", P2=3.47" Prepared by Casey & Keller, Inc Printed 9/12/2025 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 68.64% Impervious Runoff Depth=4.37" Flow Length=141' Tc=5.9 min CN=74/98 Runoff=1.63 cfs 0.136 af Subcatchment 2: Parking Lot Runoff Area=7,305 sf 88.61% Impervious Runoff Depth=4.86" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=0.91 cfs 0.068 af Pond 3: Pervious Pavers Peak Elev=414.62' Storage=727 cf Inflow=0.91 cfs 0.068 af Discarded=0.11 cfs 0.066 af Primary=0.04 cfs 0.002 af Outflow=0.15 cfs 0.068 af Subcatchment 4: Proposed Runoff Area=8,332 sf 56.96% Impervious Runoff Depth=4.08" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=0.90 cfs 0.065 af Pond 5: Pipes Peak Elev=412.73' Storage=267 cf Inflow=0.90 cfs 0.067 af Discarded=0.03 cfs 0.033 af Primary=0.66 cfs 0.034 af Outflow=0.68 cfs 0.067 af Subcatchment 6: Bypass Runoff Area=605 sf 0.00% Impervious Runoff Depth=2.67" Flow Length=128' Tc=6.0 min CN=74/0 Runoff=0.04 cfs 0.003 af Link 7: Proposed Inflow=0.70 cfs 0.037 af Primary=0.70 cfs 0.037 af 22