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• For the SLOSS method of predicting sediment ySeld, the flow path of a <br />subwatershed 1s separated Into slope segments and detachment, transport, and <br />deposition are calculated for each segment. In this manner the model acrnunts <br />for deposition along the series of slope segments. This method requires much <br />the same data (CN, K, CP) as required by the MUSLE method except that the <br />length of slope and average slope parameters are the actual length of slope <br />and average slope for each slope segment. <br />After the waste material has been placed. the configuration of the drainage <br />basin deptcted on Figure 1 will be as presented on Figure 2. The numbers on <br />Figure 2 depict the individual subwatersheds utilized in the analysis. In <br />~.. <br />general, each subwatershed consists of a 2H:1V slope area and the bench below <br />that slope. Exceptions are subwatersheds 1 and 2 which will not be disturbed <br />by disposal operations, subwatershed 3 which is the uppermost bench and <br />subwatershed 13 which is the lowermost slope area. As shown on Figure 2, <br />l ditches have been placed around the waste material to revent flow from <br />• \ u ur ed areas from crossing the waste material. A section view of the <br />final configuration of the drainage basin is presented on Figure 3. The total <br />area of the drainage basin is 85.1 acres and approximately 61.4 acres of this <br />will be covered with waste material at the completion of disposal operations. <br />Initial design concepts called for a double ditch systen Tn which runoff from <br />undisturbed areas was routed around the sediment pond. Based on the amount of <br />water that the sediment pond is required to hold, the dam location was moved <br />further down the drainage basin than originally planned making it difficult to <br />divert waters from undisturbed areas around the pond. In addition, the <br />relatively small amount of undisturbed area at the end of refuse disposal <br />results in minimal additional runoff and it was decided that it would be more <br />econanical and practical to design the vond to handle all of the runoff from <br />the drainage basin. It should be reiterated, however, that the design has <br />_. <br />been developed to prevent runoff from disturbed areas from flowing across the <br />waste materials. <br />As shown on Figure 2, the drainage basin was divided into 13 subwatersheds. <br />• ~ The necessary parameters for estimating the runoff from each of these <br />