2022 08 Drainage Report

2022-07-28 Proposed Hydrology NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 9/5/2022 HydroCAD® 10.20-2¢_ sin 08640 © 2021 HydroCAD Software Solutions LLC Page 117 Summary for Subcatchment 7S: Ba: C-Imp. Runoff = 0.75 cfs @_ 12.17 hrs, Volume= 0.075 af, Depth= 8.42" Routed to Pond 5P : Basin C 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 4,635 ___98__ Unconnected pavement, HSG C 4,635 100.00% Impervious Area 4,635 40.00% Unconnected Te Length Slope Velocity Capacity Description (min) (feet) (fit) _(fuisec) ___(cfs) 10.0 Direct Entry, Direct Subcatchment 7S: Basin C - Imp. tydrograph ow (Brea) a NOAA 24-hr D ie 100-Year Rainfall=8.66" 06: -Runoff Area=4,635 sf iat Runoff Volume=0.075 af $ as Runoff Depth=8.42" i oa ~- Te=10.0 min as] 094 CN=98 of O24 OO TO 1214 16 100 22 24 28 28 30 32 34 96 38 40 42 44 48 48 50 £2 54 86 $8.60 62 GE 60.65 7072 “Time (hours) 2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering 40.20-24 sin 08640 © 2021 HydroCAD Software Solutions LLC Time Precip. Excess hours) (inches: (inches) 0.00 0.01 0,08 0.17 0.28 NOAA 24-hr D 100-Year Rainfall=8.66" Printed 8/5/2022 4 Hydrograph for Subcatchment 7S: Basin C - Imp. Runoff 1 Precip. Excess Runoff (cis