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PERMFILE138126
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PERMFILE138126
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Last modified
8/24/2016 10:38:44 PM
Creation date
11/26/2007 7:04:37 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1991078A
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
Exhibit 09 Protection of the Hydrologic Balance
Media Type
D
Archive
Yes
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• HAUL ROAD DRAINAGE EXHIBIT 9 <br />HAUL ROAD BORROW DITCHES <br />FLOW IN A TRIANGULAR CHANNEL - 6% SLOPE <br />ENTER DEPTH D 0.400 FEET <br />ENTER SLOPE S 0.060 EXPRESS AS DECIMAL <br />ENTER "N" N 0.030 EXPRESS AS DECIMAL <br />ENTER SIDE SLOPE X 2.000 SLOPE = X:1 <br />AREA=(W*D)+(X*D"2)= 0.32 FEET"2 <br />WETTED PERIMETER=(W)+'L((XD"2+D"211".5 1.79 FEET <br />R=AREA/WETTED PERMITER 0.18 <br />V=(1.49/N)*(R".6671*(S".5)= 3.86 FEET/SEC <br />Q = A X V = 1.24 CFS <br />Q REQUIRED 1.23 <br />The borrow ditches are designed to be 2' deep. For <br />run-off purposes they need to be less that 1' deep. <br />Ditch relief drains will be constructed every 1000' on <br />each side of the haul road. The flow velocity in the borrow <br />ditch with 6% grade will be moderately erosive at peak flow. <br />• If down cutting occurs in the borrow ditches, intermediate <br />ditch relief drains will be constructed. <br /> <br />9-22 <br />
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