2022 08 Drainage Report

2022-07-21 Existing Hydrology NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-24_ s/n 08640 © 2021 HiydroCAD Software Solutions LLC z 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 Avo. - Imp. Runoff Area=2,696 sf_100.00% Impervious Runoff Depth=3.21" Flow Length=330' To=23.5 min CN=98 Runoff=0.12 cfs 0.017 af ‘Subcatchment 38: Mt. Pleasant Ave. - Pery. Runoff Area=158,870 sf 0.00% Impervious Runoff Depth=0.97" Flow Length=245' Tc=24,8 min CN=70 Runoff=2.21 cfs 0.295 af Link 2L: Mt. Pleasant Ave. Inflow=2.33 cfs 0.312 af Primary=2.33 cfs 0.312 af Total Runoff Area = 3.709 ac_Runoff Volume = 0.312 af Average Runoff Depth = 1.01" 98.33% Pervious = 3.647 ac 1.67% Impervious = 0.062 ac 2022-07-21 Existing Hydrology NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC. Page 8 Summary for Subcatchment 1S: Mt. Pleasant Ave. - Imp. Runoff = 0.12cfs@ 12.33hrs, Volume= 0.017 af, Depth= 3.21" 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 2-Year Rainfall=3.44" Area (sf)_ CN __ Description 2,345 98 Unconnected pavement, HSG C 35198 _Unconnected pavement, HSG B 2,696 98 Weighted Average 2,696 100.00% Impervious Area 2,696 100.0% Unconnected Te Length Slope Velocity Capacity Description (min) (feet) __(fvft)_(fl/sec)_(cfs) 224 100 0.0165 0.07 ‘Sheet Flow, Sheet Flow (AB) Woods: Light underbrush n= 0.400 P2= 3.44" Shallow Concentrated Flow, SCF - Unpaved (BC) Unpaved_Kv= 16.1 fos 11 230 0.0489 3.56 23.5 330 Total Subcatchment 1S: Mt. Pleasant Ave. - Imp. Hydrograph on (oor) on NOAA 24-hir D one 2-Year Rainfall=3.44" Runoff Area=2,696 sf bet Runoff Volume=0.017 af a Runoff Depth=3.21" eee Flow Length=330' 0 Tc=23.5 min 4 CN=98 03 ace oar 0-2 8 © 8 10 1214 16 10 22 24 26 28 30 2 34 36 28 40 42 44 40 48 60 82 G4 $8 $8.60 G2 G4 66.68 7072 Time (hours)