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MSE 24-hr 3 2-Year Rainfall=2.86"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 7HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Area (ac) CN Description
<br />0.269 70 Woods, Good, HSG C
<br />*0.011 98
<br />0.280 71 Weighted Average
<br />0.269 70 96.07% Pervious Area
<br />0.011 98 3.93% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet)(ft/ft) (ft/sec)(cfs)
<br />9.0 Direct Entry,
<br />Summary for Reach 1R: Proposed to Offsite
<br />Inflow Area =18.107 ac, 13.16% Impervious, Inflow Depth = 0.79" for 2-Year event
<br />Inflow =10.53 cfs @ 12.30 hrs, Volume=1.194 af
<br />Outflow =10.53 cfs @ 12.30 hrs, Volume=1.194 af, Atten= 0%, Lag= 0.0 min
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />Summary for Pond CB3: Inlet at street
<br />Inflow Area =2.961 ac, 13.54% Impervious, Inflow Depth = 0.91" for 2-Year event
<br />Inflow =2.84 cfs @ 12.28 hrs, Volume=0.224 af
<br />Outflow =2.84 cfs @ 12.28 hrs, Volume=0.223 af, Atten= 0%, Lag= 0.0 min
<br />Primary =2.84 cfs @ 12.28 hrs, Volume=0.223 af
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 961.27' @ 12.28 hrs Surf.Area= 23 sf Storage= 44 cf
<br />Plug-Flow detention time= 4.6 min calculated for 0.223 af (100% of inflow)
<br />Center-of-Mass det. time= 2.2 min ( 821.9 - 819.8 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 958.00'861 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 />958.00 13 0 0
<br />961.00 13 39 39
<br />962.00 50 32 71
<br />963.00 440 245 316
<br />964.00 650 545 861
<br />Device Routing Invert Outlet Devices
<br />#1 Primary 958.00'18.0" Round Culvert L= 60.0' Ke= 0.500
<br />Inlet / Outlet Invert= 958.00' / 957.00' S= 0.0167 '/' Cc= 0.900
<br />n= 0.013, Flow Area= 1.77 sf
<br />#2 Device 1 961.00'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads
<br />MSE 24-hr 3 2-Year Rainfall=2.86"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 8HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Primary OutFlow Max=2.84 cfs @ 12.28 hrs HW=961.27' TW=0.00' (Dynamic Tailwater)
<br />1=Culvert (Passes 2.84 cfs of 13.50 cfs potential flow)
<br />2=Orifice/Grate (Weir Controls 2.84 cfs @ 1.69 fps)
<br />Summary for Pond P1i: Infiltration Basin 1
<br />Inflow Area =5.329 ac, 26.82% Impervious, Inflow Depth = 1.17" for 2-Year event
<br />Inflow =6.54 cfs @ 12.27 hrs, Volume=0.520 af
<br />Outflow =1.29 cfs @ 12.86 hrs, Volume=0.520 af, Atten= 80%, Lag= 34.9 min
<br />Discarded =0.04 cfs @ 12.86 hrs, Volume=0.197 af
<br />Primary =1.25 cfs @ 12.86 hrs, Volume=0.324 af
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 951.88' @ 12.86 hrs Surf.Area= 7,045 sf Storage= 11,474 cf
<br />Plug-Flow detention time= (not calculated: outflow precedes inflow)
<br />Center-of-Mass det. time= 656.1 min ( 1,457.2 - 801.2 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 950.00'38,556 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 />950.00 5,166 0 0
<br />951.00 6,140 5,653 5,653
<br />952.00 7,165 6,653 12,306
<br />954.00 9,390 16,555 28,861
<br />955.00 10,000 9,695 38,556
<br />Device Routing Invert Outlet Devices
<br />#1 Discarded 950.00'0.250 in/hr Exfiltration over Surface area
<br />#2 Primary 947.50'18.0" Round Culvert L= 50.0' Ke= 0.500
<br />Inlet / Outlet Invert= 947.50' / 947.00' S= 0.0100 '/' Cc= 0.900
<br />n= 0.013, Flow Area= 1.77 sf
<br />#3 Device 2 951.00'8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
<br />#4 Device 2 952.00'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
<br />Discarded OutFlow Max=0.04 cfs @ 12.86 hrs HW=951.88' (Free Discharge)
<br />1=Exfiltration (Exfiltration Controls 0.04 cfs)
<br />Primary OutFlow Max=1.25 cfs @ 12.86 hrs HW=951.88' TW=0.00' (Dynamic Tailwater)
<br />2=Culvert (Passes 1.25 cfs of 16.22 cfs potential flow)
<br />3=Orifice/Grate (Orifice Controls 1.25 cfs @ 3.57 fps)
<br />4=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs)
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