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MSE 24-hr 3 2-Year Rainfall=2.81"2039 Existing (9-21-22)
<br /> Printed 9/21/2022Prepared by Plowe Engineering, Inc.
<br />Page 2HydroCAD® 10.00-24 s/n 01574 © 2018 HydroCAD Software Solutions LLC
<br />Summary for Subcatchment EN:
<br />Runoff = 0.72 cfs @ 12.27 hrs, Volume= 3,744 cf, Depth= 0.33"
<br />Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-100.00 hrs, dt= 0.01 hrs
<br />MSE 24-hr 3 2-Year Rainfall=2.81"
<br />Area (sf) CN Description
<br />* 8,660 98 Impervious
<br />100,000 55 Woods, Good, HSG B
<br />26,592 61 >75% Grass cover, Good, HSG B
<br />135,252 Weighted Average
<br />126,592 56 93.60% Pervious Area
<br />8,660 98 6.40% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet) (ft/ft) (ft/sec) (cfs)
<br />15.4 150 0.1186 0.16 Sheet Flow,
<br />Woods: Light underbrush n= 0.400 P2= 2.86"
<br />1.0 140 0.2111 2.30 Shallow Concentrated Flow,
<br />Woodland Kv= 5.0 fps
<br />16.4 290 Total
<br />Summary for Subcatchment ES:
<br />Runoff = 0.23 cfs @ 12.25 hrs, Volume= 1,013 cf, Depth= 0.38"
<br />Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-100.00 hrs, dt= 0.01 hrs
<br />MSE 24-hr 3 2-Year Rainfall=2.81"
<br />Area (sf) CN Description
<br />* 2,245 98 Impervious
<br />17,000 55 Woods, Good, HSG B
<br />13,044 61 >75% Grass cover, Good, HSG B
<br />32,289 Weighted Average
<br />30,044 58 93.05% Pervious Area
<br />2,245 98 6.95% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet) (ft/ft) (ft/sec) (cfs)
<br />13.9 145 0.1444 0.17 Sheet Flow,
<br />Woods: Light underbrush n= 0.400 P2= 2.86"
<br />Summary for Pond ELA: EXISTING LOW AREA
<br />Inflow Area = 135,252 sf, 6.40% Impervious, Inflow Depth = 0.33" for 2-Year event
<br />Inflow = 0.72 cfs @ 12.27 hrs, Volume= 3,744 cf
<br />Outflow = 0.32 cfs @ 12.67 hrs, Volume= 3,489 cf, Atten= 56%, Lag= 23.9 min
<br />Primary = 0.32 cfs @ 12.67 hrs, Volume= 3,489 cf
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-100.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 862.58' @ 12.67 hrs Surf.Area= 4,965 sf Storage= 1,193 cf
<br />Flood Elev= 864.90' Surf.Area= 21,607 sf Storage= 35,701 cf
<br />Plug-Flow detention time= 139.2 min calculated for 3,489 cf (93% of inflow)
<br />Center-of-Mass det. time= 105.7 min ( 948.7 - 843.1 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 862.10' 61,862 cf Custom Stage Data (Prismatic) Listed below (Recalc)
<br />Elevation Surf.Area Inc.Store Cum.Store
<br />(feet) (sq-ft) (cubic-feet) (cubic-feet)
<br />862.10 0 0 0
<br />863.00 9,300 4,185 4,185
<br />864.00 18,045 13,673 17,857
<br />866.00 25,960 44,005 61,862
<br />Device Routing Invert Outlet Devices
<br />#1 Primary 861.30'15.0" Round Culvert L= 61.0' Ke= 0.500 Inlet / Outlet Invert= 861.30' / 860.43' S= 0.0143 '/' Cc= 0.900
<br />n= 0.025, Flow Area= 1.23 sf
<br />#2 Device 1 862.32'15.0" Round Culvert L= 12.0' Ke= 0.500 Inlet / Outlet Invert= 862.32' / 861.30' S= 0.0850 '/' Cc= 0.900
<br />n= 0.025, Flow Area= 1.23 sf
<br />Primary OutFlow Max=0.32 cfs @ 12.67 hrs HW=862.58' (Free Discharge)
<br />1=Culvert (Passes 0.32 cfs of 3.75 cfs potential flow)
<br />2=Culvert (Inlet Controls 0.32 cfs @ 1.74 fps)
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