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MSE 24-hr 3 10-Year Rainfall=4.26"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 13HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Summary for Subcatchment P4: Direct from North
<br />Runoff =9.61 cfs @ 12.35 hrs, Volume=0.795 af, Depth= 1.90"
<br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />MSE 24-hr 3 10-Year Rainfall=4.26"
<br />Area (ac) CN Description
<br />3.390 70 Woods, Good, HSG C
<br />*1.532 85 Wetland
<br />*0.090 98
<br />5.012 75 Weighted Average
<br />4.922 75 98.20% Pervious Area
<br />0.090 98 1.80% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet)(ft/ft) (ft/sec)(cfs)
<br />23.9 Direct Entry, Same as "Existing condition" calc
<br />Summary for Subcatchment P5: Offsite Direct
<br />Runoff =6.25 cfs @ 12.26 hrs, Volume=0.456 af, Depth= 1.85"
<br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />MSE 24-hr 3 10-Year Rainfall=4.26"
<br />Area (ac) CN Description
<br />*0.401 98
<br />2.560 70 Woods, Good, HSG C
<br />2.961 74 Weighted Average
<br />2.560 70 86.46% Pervious Area
<br />0.401 98 13.54% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet)(ft/ft) (ft/sec)(cfs)
<br />11.9 100 0.1000 0.14 Sheet Flow,
<br />Woods: Light underbrush n= 0.400 P2= 2.86"
<br />5.2 500 0.1040 1.61 Shallow Concentrated Flow,
<br />Woodland Kv= 5.0 fps
<br />17.1 600 Total
<br />Summary for Subcatchment P6: Southwest corner
<br />Runoff =0.72 cfs @ 12.17 hrs, Volume=0.037 af, Depth= 1.60"
<br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />MSE 24-hr 3 10-Year Rainfall=4.26"
<br />MSE 24-hr 3 10-Year Rainfall=4.26"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 14HydroCAD® 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 = 1.76" for 10-Year event
<br />Inflow =27.20 cfs @ 12.35 hrs, Volume=2.662 af
<br />Outflow =27.20 cfs @ 12.35 hrs, Volume=2.662 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 = 1.85" for 10-Year event
<br />Inflow =6.25 cfs @ 12.26 hrs, Volume=0.456 af
<br />Outflow =6.25 cfs @ 12.26 hrs, Volume=0.455 af, Atten= 0%, Lag= 0.0 min
<br />Primary =6.25 cfs @ 12.26 hrs, Volume=0.455 af
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 961.45' @ 12.26 hrs Surf.Area= 30 sf Storage= 49 cf
<br />Plug-Flow detention time= 2.4 min calculated for 0.455 af (100% of inflow)
<br />Center-of-Mass det. time= 1.2 min ( 813.2 - 812.0 )
<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
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