1240815StormWaterManagementReport

PLEASANT VALLEY WAY 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", 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=2.60" Flow Length=141' Tc=5.9 min CN=74/98 Runoff=0.98 cfs 0.081 af Subcatchment 2: Parking Lot Runoff Area=7,305 sf 88.61% Impervious Runoff Depth=3.01" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=0.57 cfs 0.042 af Pond 3: Pervious Pavers Peak Elev=414.04' Storage=347 cf Inflow=0.57 cfs 0.042 af Discarded=0.11 cfs 0.042 af Primary=0.00 cfs 0.000 af Outflow=0.11 cfs 0.042 af Subcatchment 4: Proposed Runoff Area=8,332 sf 56.96% Impervious Runoff Depth=2.37" 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 Subcatchment 6: 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 9