2025 02 Drainage Statement Signed

2025-01 HydroCAD Prepared by Dynamic Engineering Printed 2/21/2025 NOAA 24-hr D 2-Year Rainfall=3.44" Printed 2/21/2025 2025-01 HydroCAD Prepared by Dynamic Engineering HydroCAD® 10.20-6a sin 08640 © 2024 HydroCAD Software Solutions LLC Page 6 HydroCAD® 10.20-6a sin 08640 © 2024 HydroCAD Software Solutions LLC Page 7 Pipe Listing (all nodes) Time span=0.00-30,00 hrs, dt=0.05 hrs, 601 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Line#t Node Ininvert Outinvert Length Slope Width Diam/Height Inside-Fill Node Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Number (feet) (feet) (feet) (fut) (inches) (inches) (inches) Name Subcatchment1S: ExistingImpervious Runoff Area=38,060 sf 100.00% Impervious Runoff Depth=3.21" 1 1s 0.00 0.00 50.0 0.0370 0.010 0.0 40 0.0 Flow Length=267' Tc=4.3min CN=98 Runoff=2.93 cfs 0.233 af 2 18 0.00 0.00 21.0 0.1380 0.010 0.0 10.0 0.0 338 0.00 0.00 59.0 0.0252 0.011 0.0 120 00 Subcatchment2S: Existing Pervious Runoff Area=11,289 sf_0.00% Impervious Runoff Depth=0.97" 4 38 0.00 0.00 111.0 0.0300 0.011 0.0 12.0 0.0 Te=4.3 min CN=70 Runofi=0.29 cfs 0.021 af 3 3s deo ©0008 00200 OO] ry Subcatchment3S: ProposedImpervious Runoff Area=96670 st 100.00% Inpervous Runoff Dep=.21" Flow Length=370' To=4.4 min CN=98 Runoff=2.81 cfs 0.225 af 7 38 0.00 0.00 27.0 0.0300 0.011 0.0 15.0 00 8 4s 0.00 0.00 58.0 0.0252 0.011 0.0 12.0 00 Subcatchment4S: ProposedPervious _ Runoff Area=12,691 sf 0.00% Impervious Runoff Depth=1.08" 9 48 0.00 0.00 117.0 0.0300 0.011 0.0 12.0 0.0 Flow Length=370' To=4.4 min CN=72 Runoff=0.37 cfs 0.026 af 10 4s 0.00 0.00 48.0 0.0200 0.011 0.0 12.0 0.0 148 0.00 0.00 26.0 0.0200 0.011 0.0 12.0 0.0 Link SL: Existing Total 12 48 0.00 0.00 27.0 0.0300 0.011 0.0 15.0 0.9 Inflow=3.17 cfs 0.251 af Primary=3.17 cfs 0.251 af Link 6L: Proposed Total Total Runoff Area = 2.266 ac Runoff Volume = 0.506 af Average Runoff Depth = 2.68" 24.29% Pervious = 0.551 ac 75.71% Impervious = 1.716 ac