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Where C = the runoff coefficient (dimensionless) <br /> i = the rainfall intensity in inches per hour <br /> A = the basin area <br /> Because the area above the waste rock pile is steeply sloping and riot <br /> well vegetated, a runoff coefficient of 0.60 was selected. <br /> In order to divert the runoff from the design storm away from the waste <br /> rock pile, a ditch and culvert system were designed. The ditches <br /> will divert runoff from the high ground above the waste rock pile. <br /> Two shallow ditches will run parallel to the top of the waste rock <br /> pile, and will be dug into the existing terrain. The first ditch <br /> will direct water which enters the site from the vicinity of the access <br /> road (Exhibit C-1) . The water will travel along the south side of the <br /> road to a concrete drop box and culvert. The second ditch will divert <br /> the remaining water around the west end of the waste rock pile to the <br /> naturally occurring drainage. <br /> The culvert will be four feet in diameter and will be constructed of <br /> galvanized corrugated steel . It will run in a northeasterly direction <br /> from the drop box underneath the waste pile. The drop box will be lo- <br /> cated near the junction of the road and office building. At the down- <br /> stream end of the culvert a concrete energy dissipation structure will <br /> be provided to prevent erosion. The water will then continue along the <br /> natural drainage located directly below the portal shown on Exhibit C-1. <br /> It should be noted here that the plan described above is designed to <br /> protect the naturally occurring drainages and to prevent runoff from <br /> I <br />