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• If corrective measures described above fail, WFC proposes to observe and reevaluate the <br />situation. A combination of the first two methods described or some variation therein will be <br />applied. These activities can include, but are not limited to, rock channels, contour furrows or <br />laterals with rock or matting bottoms, V ditches made with the dozer or motor grader, and <br />subsequent revegetation. <br />Head cutting in channels will be controlled by a number of methods. If the area is at a point that <br />concentrates runoff, the area will be improved to accept this runoff. This would include <br />reshaping the channel and channel bottom, covering with erosion matting, seeding, or rocking. <br />Inlet channel erosion will be conVolled down to the average water level of the ponds. Remedial <br />action on pond slopes will extend as far down the slopes as equipment access allows, which at a <br />minimum will be below the level of the principal spillway of each pond. <br />In other areas, depending on the extent of erosion and time of year, the area will be regraded, <br />disked, and seeded as needed. Straw bales, erosion matting, or rock fill may also be used to <br />stabilize the area. <br />When sedimentation ponds are removed, the affected land will be regraded and revegetated <br />pursuant to the OMLRD's regulations, Section 4.05.17 and the approved Peabody Reclamation <br />Plan. <br />• <br />Design Meth. odoloav <br />The precipitation runoff (peak flow and volume) is estimated using the Soil Conservation Service <br />(SCS) triangular hydrograph techniques as described in D~gn of Small Dams (U.S. Dept. of <br />Interior, 1977). Computations necessary for this runoff estimating technique have been <br />computerized by various individuals and agencies. <br />SEDIMOT II (see Attachment A), was developed by Research Specialist Bruce N. Wilson, <br />Professor Billy J. Barfield, and Assistant Professor Ian D. Moore at the Department of Agricultural <br />Engineering, University of Kentucky, Lexington, Kentucky. This program is used to estimate <br />runoff peak flow and volume which are necessary for the design of sediment ponds. A copy of <br />the computer program's input and output file information has been included in each <br />sedimentation pond design report. <br />The input consists of precipitation amount (inches), watershed area (acres), time of concenVation <br />(hours), runoff curve number (CN), representative particle-size distributions of the soil types in <br />the watershed, sedimentology information, spillway information, etc. <br /> <br />13-6 <br />