2022 08 Drainage Report

2022-07-21 Existing Hydrology NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 8/5/2022 HydroGAD® 10,20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC Page 21 Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method ‘Subcatchment 1S: Mt. Pleasant Ave. - Imp. Runoff Are: 696 sf 100.00% Impervious Runoff Depth=8.42" Flow Length=: ‘To=23.5 min CN=98 Runoff=0.32 cfs 0.043 af ‘Subcatchment 3S: Mt. Pleasant Ave. - Perv. Runoff Area=158,870 sf 0.00% Impervious Runoff Depth=5.04" Flow Length=245' Tc=24.8 min CN=70 Runoff=12.53 cfs 1.531 af Link 2L: Mt. Pleasant Ave. Inflow=12.84 cfs 1.574 af Primary=12.84 cfs 1.574 af Total Runoff Area = 3.709 ac_Runoff Volume = 1.574 af Average Runoff Depth = 5.09" ‘98.33% Pervious = 3.647 ac 1.67% Impervious = 0.062 ac 2022-07-21 Existing Hydrology NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC Page 22 Summary for Subcatchment 1S; Mt. Pleasant Ave. - Imp. Runoff = 0.32 cfs @ 12.32 hrs, Volume= 0.043 af, Depth= 8.42" Routed to Link 2L : Mt. Pleasant Ave. Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=8.66" ‘Area (sf) __CN__ Description 2,345 98 + Unconnected pavement, HSG C 351 98 _Unconnected pavement, HSG B 2,696 98 Weighted Average 2,696 10.00% Impervious Area 2,696 100,00% Unconnected Te Length Slope Velocity Capacity Description (min) (feet) _(ft/t)_(ftiseo)_(cs) 224 100 0.0165 0.07 14 230 0.0489 «3.56 ‘Sheet Flow, Sheet Flow (AB) Woods: Light underbrush n= 0.400 P2= 3.44" Shallow Concentrated Flow, SCF - Unpaved (BC) Unpaved _Kv= 16.1 fps 23.5 330 Total Subcatchment 1S: Mt. Pleasant Ave. - Imp. Hydrograph 038 Lom ve NOAA 24-hr D Sad 100-Year Rainfall=8.66" id Runoff Area=2,696 sf _ 07 Runoff Volume=0.043 af Eee Runoff Depth=8.42" 2 ove Flow Length=330" be Tc=23.5 min es CN=98 coef ae] we om of ORT ow wie WW Lee BO a8 2032 3 AO 14 4 48 9 20490 600 O24 EB 7072 Time (hours