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PERMFILE48355
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PERMFILE48355
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Last modified
8/24/2016 10:50:19 PM
Creation date
11/20/2007 1:33:39 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1996083A
IBM Index Class Name
Permit File
Doc Date
3/23/2004
Doc Name
Appendix A to Appendix C - Report Dated 11/10/03
Section_Exhibit Name
Coal Mine Waste Disposal Area No. 2
Media Type
D
Archive
Yes
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Spillway Pond F <br />Determine flow velocity down 3h:1 v embankment <br />Pond F Emergency Spillway <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />Depth D 0.41 Feet <br />Width W 10 Feet <br />Slope S 0.33 Express as Decimal <br />Mannings "N" N 0.04 Express as Decimal <br />Side. Slope X 2 Slope = X:1 <br />AREA=(W*D)+(X*D^2)= <br />WETTED PERIMETER=(W)+2*[((X*D)^2+D^2)^0.5] <br />R=AREA/WETTED 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)y`2 <br />D50 = Diameter in feet <br />V =Velocity <br />S =Slope <br />i• <br />D50 = 1.48 feet <br />18 inches <br />App-B - 6 - <br />4.44 FEET^2 <br />11.83 FEET <br />0.37 <br />11.13 FT/SEC <br />49.35 CFS <br />48.59 CFS <br />11 /03 <br />
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