|
MSE 24-hr 3 100-Year Rainfall=7.32"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 19HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Area (ac) CN Description
<br />*0.054 98
<br />2.869 70 Woods, Good, HSG C
<br />2.923 71 Weighted Average
<br />2.869 70 98.15% Pervious Area
<br />0.054 98 1.85% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet)(ft/ft) (ft/sec)(cfs)
<br />12.0 Direct Entry,
<br />Summary for Subcatchment P3: Proposed to Basin
<br />Runoff =6.07 cfs @ 12.15 hrs, Volume=0.312 af, Depth= 4.82"
<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 3 100-Year Rainfall=7.32"
<br />Area (ac) CN Description
<br />*0.140 98
<br />0.638 74 >75% Grass cover, Good, HSG C
<br />0.778 78 Weighted Average
<br />0.638 74 82.01% Pervious Area
<br />0.140 98 17.99% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet)(ft/ft) (ft/sec)(cfs)
<br />8.0 Direct Entry,
<br />Summary for Subcatchment P3A: Proposed to Basin
<br />Runoff =2.66 cfs @ 12.15 hrs, Volume=0.138 af, Depth= 4.92"
<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 3 100-Year Rainfall=7.32"
<br />Area (ac) CN Description
<br />*0.073 98
<br />0.263 74 >75% Grass cover, Good, HSG C
<br />0.336 79 Weighted Average
<br />0.263 74 78.27% Pervious Area
<br />0.073 98 21.73% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet)(ft/ft) (ft/sec)(cfs)
<br />8.0 Direct Entry,
<br />MSE 24-hr 3 100-Year Rainfall=7.32"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 20HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Summary for Subcatchment P4: Direct from North
<br />Runoff =22.86 cfs @ 12.35 hrs, Volume=1.871 af, Depth= 4.48"
<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 3 100-Year Rainfall=7.32"
<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 =15.05 cfs @ 12.26 hrs, Volume=1.066 af, Depth= 4.32"
<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 3 100-Year Rainfall=7.32"
<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 =1.82 cfs @ 12.17 hrs, Volume=0.094 af, Depth= 4.01"
<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 3 100-Year Rainfall=7.32"
<br />167
|