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2016-11-07_PERMIT FILE - C1996083A
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2016-11-07_PERMIT FILE - C1996083A
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Last modified
7/20/2017 7:01:25 AM
Creation date
11/10/2016 8:00:24 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1996083A
IBM Index Class Name
Permit File
Doc Date
11/7/2016
Doc Name
Appendix A through Appendix C
Section_Exhibit Name
Volume IX Coal Mine Waste Disposal Area No. 2
Media Type
D
Archive
Yes
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Spillway Pond F <br />Determine flow characteristics down 10.3% Grade <br />Pond F Emergency Spillway <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />Depth <br />D <br />0.9 <br />Feet <br />Width <br />W <br />5 <br />Feet <br />Slope <br />S <br />0.103 <br />Express as Decimal <br />Mannings "N" <br />N <br />0.04 <br />Express as Decimal <br />Side Slope <br />X <br />2 <br />Slope = X:1 <br />AREA=(W*D)+(X*D^2)= <br />WETTED PERIMETER=(W)+2*[((X*D)A2+D"2)^0.5] <br />R=AREAIWETTED PERIMETER <br />V=(1.49/N)*(R^.667)*(S^.5)= <br />Q=AXV= <br />Q REQUIRED - Peak Discharge <br />Sediment Pond F <br />Riprap Sizing - Down Face of Embankment - Pond F <br />D50 = Size of Riprap <br />D50 = ((V X S^.17)[7.58))^2 <br />D50 = Diameter in feet <br />V = Velocity <br />S = Slope <br />D50 = 0.68 feet <br />6.12 FEET ^2 <br />9.02 FEET <br />0.68 <br />9.23 FT/SEC <br />56.47 CFS <br />55.59 CFS <br />8 inches Use 6" to 18" Rock <br />TR -81 App. B-8 10/13 <br />
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