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24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 3HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Area Listing (all nodes)
<br />Area
<br />(acres)
<br />CN Description
<br />(subcatchment-numbers)
<br />2.382 98 (P1, P2, P2A, P3, P3A, P4, P5, P6)
<br />1.549 74 >75% Grass cover, Good, HSG C (P1, P2, P3, P3A)
<br />1.532 85 Wetland (P4)
<br />12.644 70 Woods, Good, HSG C (P1, P2A, P4, P5, P6)
<br />18.107 75 TOTAL AREA
<br />MSE 24-hr 3 2-Year Rainfall=2.86"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 4HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Summary for Subcatchment P1: Proposed to Basin
<br />Runoff =6.54 cfs @ 12.27 hrs, Volume=0.520 af, Depth= 1.17"
<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 2-Year Rainfall=2.86"
<br />Area (ac) CN Description
<br />*1.429 98
<br />0.344 74 >75% Grass cover, Good, HSG C
<br />3.556 70 Woods, Good, HSG C
<br />5.329 78 Weighted Average
<br />3.900 70 73.18% Pervious Area
<br />1.429 98 26.82% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet)(ft/ft) (ft/sec)(cfs)
<br />10.4 100 0.0200 0.16 Sheet Flow,
<br />Grass: Short n= 0.150 P2= 2.86"
<br />7.3 650 0.0880 1.48 Shallow Concentrated Flow,
<br />Woodland Kv= 5.0 fps
<br />17.7 750 Total
<br />Summary for Subcatchment P2: Proposed to Basin
<br />Runoff =1.12 cfs @ 12.15 hrs, Volume=0.061 af, Depth= 1.50"
<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 2-Year Rainfall=2.86"
<br />Area (ac) CN Description
<br />*0.184 98
<br />0.304 74 >75% Grass cover, Good, HSG C
<br />0.488 83 Weighted Average
<br />0.304 74 62.30% Pervious Area
<br />0.184 98 37.70% 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 P2A: Direct
<br />Runoff =2.51 cfs @ 12.22 hrs, Volume=0.164 af, Depth= 0.67"
<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 2-Year Rainfall=2.86"
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