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MSE 24-hr 3 100-Year Rainfall=7.36"2039 Existing
<br /> Printed 7/25/2022Prepared by Plowe Engineering, Inc.
<br />Page 5HydroCAD® 10.00-24 s/n 01574 © 2018 HydroCAD Software Solutions LLC
<br />Summary for Subcatchment EN:
<br />Runoff = 2.73 cfs @ 12.30 hrs, Volume= 12,724 cf, Depth= 1.13"
<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 3 100-Year Rainfall=7.36"
<br />Area (sf) CN Description
<br />* 8,660 98 Impervious
<br />100,000 36 Woods, Fair, HSG A
<br />26,592 39 >75% Grass cover, Good, HSG A
<br />135,252 Weighted Average
<br />126,592 37 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 = 0.79 cfs @ 12.25 hrs, Volume= 3,262 cf, Depth= 1.21"
<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 3 100-Year Rainfall=7.36"
<br />Area (sf) CN Description
<br />* 2,245 98 Impervious
<br />17,000 36 Woods, Fair, HSG A
<br />13,044 39 >75% Grass cover, Good, HSG A
<br />32,289 Weighted Average
<br />30,044 37 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 = 1.13" for 100-Year event
<br />Inflow = 2.73 cfs @ 12.30 hrs, Volume= 12,724 cf
<br />Outflow = 0.21 cfs @ 15.20 hrs, Volume= 12,724 cf, Atten= 92%, Lag= 174.3 min
<br />Discarded = 0.21 cfs @ 15.20 hrs, Volume= 12,724 cf
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-100.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 863.25' @ 15.20 hrs Surf.Area= 11,406 sf Storage= 6,747 cf
<br />Flood Elev= 864.90' Surf.Area= 21,358 sf Storage= 35,366 cf
<br />Plug-Flow detention time= 389.1 min calculated for 12,723 cf (100% of inflow)
<br />Center-of-Mass det. time= 389.1 min ( 1,226.9 - 837.8 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 862.10' 61,245 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 17,810 13,555 17,740
<br />866.00 25,695 43,505 61,245
<br />Device Routing Invert Outlet Devices
<br />#1 Discarded 862.10'0.800 in/hr Infiltration over Surface area
<br />Discarded OutFlow Max=0.21 cfs @ 15.20 hrs HW=863.25' (Free Discharge)
<br />1=Infiltration (Exfiltration Controls 0.21 cfs)
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