1240815StormWaterManagementReport

PLEASANT VALLEY WAY 1240815-pipes NOAA 24-hr D 100-Year-2020 Rainfall=9.18", 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=8.02" Flow Length=141' Tc=5.9 min CN=74/98 Runoff=2.97 cfs 0.249 af Subcatchment 2: Parking Lot Runoff Area=7,305 sf 88.61% Impervious Runoff Depth=8.60" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=1.58 cfs 0.120 af Pond 3: Pervious Pavers Peak Elev=415.25' Storage=1,132 cf Inflow=1.58 cfs 0.120 af Discarded=0.11 cfs 0.094 af Primary=0.64 cfs 0.027 af Outflow=0.74 cfs 0.120 af Subcatchment 4: Proposed Runoff Area=8,332 sf 56.96% Impervious Runoff Depth=7.67" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=1.68 cfs 0.122 af Pond 5: Pipes Peak Elev=414.08' Storage=640 cf Inflow=2.19 cfs 0.149 af Discarded=0.03 cfs 0.045 af Primary=1.80 cfs 0.104 af Outflow=1.83 cfs 0.149 af Subcatchment 6: Bypass Runoff Area=605 sf 0.00% Impervious Runoff Depth=5.99" Flow Length=128' Tc=6.0 min CN=74/0 Runoff=0.09 cfs 0.007 af Link 7: Proposed Inflow=1.89 cfs 0.111 af Primary=1.89 cfs 0.111 af 35