2017-07-24_PERMIT FILE - C1996083A (5)

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Ditch D -D2 Ditch D -D2 is formed when the flow from ditch D -D1 and ditch D -E1 join below sediment pond C. From the intersection of the two flows the ditch becomes a V -Ditch that must be capable of handling the combined flow from the two ditches (1.79 + 7.91) = 9.70. The following information is generated from the use of the computer programs SedCad 4. The ditch side slopes are 1.5h:1 V, Manning's n =0.3 Flow cfs Ditch Flow Velocity Grade Depth fps 9.7 2% 1.13 5.09 9.7 10% 0.99 9.3 Ditch D -2 has been constructed at least two feet to allow for freeboard. The section with the 10% grade has been constructed with riprap to provide erosion protection. Culvert C -D1 Culvert C -D1 is located in ditch D -D2. A 30" culvert has been installed. Ditch D -D2 has been constructed at least 30" deep at the transition between the ditch and culvert. Drainage Area E Drainage area E is the upland area located above the haul road that provides access to the gob pile. A berm has been constructed along the south side of the road to contain runoff to the site. A single ditch has been constructed on the north side of the road to handle the flow from drainage area E. The peak flow for this area is 1.79 cfs. Ditch E -1 Drainage area E is the upland area located above the haul road that provides access to the gob pile. A berm has been constructed along the south side of the road to contain run -off to the site. A single ditch has been constructed on the north side of the road Flow cfs Ditch Flow Velocity Grade Depth fps 1.79 2% 0.65 2.9 Ditch E -1 has been constructed at least 1.5 feet deep to allow for freeboard. Alternative sediment control features has been installed in the ditch to trap sediment before it leaves the site. Culvert C -E1 Culvert C -E1 was deleted from the design Jan. 1998 TR -84 EXH -8 -12 06/14