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MSE 24-hr 3 2-Year Rainfall=2.81"2039 Proposed (8-5-22)
<br /> Printed 8/5/2022Prepared by Plowe Engineering, Inc.
<br />Page 2HydroCAD® 10.00-24 s/n 01574 © 2018 HydroCAD Software Solutions LLC
<br />Summary for Subcatchment N:
<br />Runoff = 4.38 cfs @ 12.14 hrs, Volume= 10,295 cf, Depth= 0.81"
<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 />* 40,225 98 New Impervious
<br />* 7,675 98 CSAH 85
<br />20,000 30 Woods, Good, HSG A
<br />84,528 39 >75% Grass cover, Good, HSG A
<br />152,428 Weighted Average
<br />104,528 37 68.58% Pervious Area
<br />47,900 98 31.42% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet) (ft/ft) (ft/sec) (cfs)
<br />7.0 Direct Entry,
<br />Summary for Subcatchment S:
<br />Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0 cf, Depth= 0.00"
<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 />12,500 36 Woods, Fair, HSG A
<br />2,613 39 >75% Grass cover, Good, HSG A
<br />15,113 Weighted Average
<br />15,113 37 100.00% Pervious 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 LA: ADJUSTED LOW AREA
<br />Inflow Area = 152,428 sf, 31.42% Impervious, Inflow Depth = 0.81" for 2-Year event
<br />Inflow = 4.38 cfs @ 12.14 hrs, Volume= 10,295 cf
<br />Outflow = 0.32 cfs @ 12.93 hrs, Volume= 10,296 cf, Atten= 93%, Lag= 47.7 min
<br />Discarded = 0.32 cfs @ 12.93 hrs, Volume= 10,296 cf
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-100.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 863.26' @ 12.93 hrs Surf.Area= 17,516 sf Storage= 4,456 cf
<br />Flood Elev= 864.90' Surf.Area= 19,900 sf Storage= 35,505 cf
<br />Plug-Flow detention time= (not calculated: outflow precedes inflow)
<br />Center-of-Mass det. time= 100.7 min ( 855.7 - 755.0 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 863.00' 58,000 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 />863.00 17,000 0 0
<br />864.00 19,000 18,000 18,000
<br />866.00 21,000 40,000 58,000
<br />Device Routing Invert Outlet Devices
<br />#1 Discarded 863.00'0.800 in/hr Infiltration over Surface area
<br />Discarded OutFlow Max=0.32 cfs @ 12.93 hrs HW=863.26' (Free Discharge)
<br />1=Infiltration (Exfiltration Controls 0.32 cfs)
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