2022 08 Drainage Report

2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering HydroCAD® 10.20-24_ sin 08640 © 2021 HydroCAD Software Solutions LLC NOAA 24-hr D 100-Year Rainfall=8.66" Printed 8/5/2022 424 Summary for Subcatchment 9S: Mt. Pleasant Ave Undetained - Imp. Runoff = 0.28 cfs @ 12.17 hrs, Volume= Routed to Link 3L : Mt. Pleasant Ave - Undetained 0.027 af, Depth= 8.42" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hrD 100-Year Rainfall=8.66" Area (sf)__CN__Desoription 1,085 98 Unconnected pavement, HSG C 621__98__ Unconnected pavement, HSG D 7,708 98 Weighted Average 1,706 100.00% Impervious Area 1,708 4100.00% Unconnected Te Length Slope Velocity Capacity Description (min) (feet) _(ftft)_(fsec) (cfs). 10.0 Direct Entry, Direct Subcatchment 9S: Mt. Pleasant Ave Undetained - Imp. Hydrograph os4 | NOAA 24-hr D o2| 100-Year Rainfall=8.66" my Runoff Area=1,706 sf awl Runoff Volume=0.027 af re Runoff Depth=8.42" Boxe] Tc=10.0 min bo CN=98 (0-2 4G 8 WO IRI 16 1020 22 24 20 28 30 32 34 95 38 40.42 44 AO 48 50 52 54 56 $8.60 62 Gt 05.63 7072 ‘Time (hours) 2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering NOAA 24-hr D 100-Year Rainfall=8.66" Printed 8/5/2022 HydroCAD® 10.20-2d sin 08640 © 2021 HydroCAD Software Solutions LLC Page 12: Hydrograph for Subcatchment 9S: Mt. Pleasant Ave Undetained - Imp. Time Precip. Excess Runoff (hours) (inches) (inches) 0.00 0.00 0.00 4.00 0.10 0.00 200 0.21 0.00 3.00 0.33 0.00 4.00 0.45 0.00 5.00 0.59 0.01 6.00 0.74 0.04 7.00 0.91 0.01 800 4.42 0.01 900 1.37 0.01 10.00 1.72 0.02 14.00 2.25 0.03 1200 4.15 0.14 13.00 6.4% 0.04 14.00 6.94 0.02 4500 7.29 0.01 16.00 7.54 0.01 47.00 7.75 0.01 18.00 7.92 0.01 49.00 8.07 0.01 20.00 8.21 0.01 21.00 8.33 0.00 2200 8.45 0.00 23.00 8.56 0.00 24.00 8.668 0.00 25.00 8.66 0.00 26.00 8.66 0.00 27.00 8.66 0.00 28.00 8.66 0.00 29.00 8.66 0.00 30.00 8.66 0.00 31.00 8.66 0.00 32.00 8.668 0.00 33.00 8.66 0.00 34.00 8.66 0.00 35.00 8.66 0.00 36.00 8.66 0.00 37.00 8.66 0.00 38.00 8.66 0.00 39.00 8.66 0.00 40.00 8.66 0.00 41.00 8.66 0.00 42.00 8.66 0.00 43,00 8.66 0.00 44.00 8.66 0.00 45.00 8.66 0.00 46.00 8.66 0.00 47.00 8.66 0.00 48.00 8.66 0.00 49.00 8.66 0.00 50.00 8.66 0.00 51.00 8.68 0.00 Time Precip. Excess Runoff (inches) (inches)