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LS = ( L 1m (17.2 sin - 0.551 for S > BB <br />• 72.6 <br />LS ~ ( 200 )0.6 • (17,2 sin 15.0° - 0.55) <br />72.6 <br />LS 1.84 (4.45 - 0.55) <br />LS = 7,2 <br />The C and P Fa c[ors. The C factor, the cover and management factor, Ss the ratio of soil <br />lose from an area with specified cover and management to that from an identical area Sn <br />tilled continuous fallow. <br />The P factor, the support practice factor, is the ratio of soil loss with a support <br />practice like contourl ng, strip croppl ng, or terracing to that with straight-row farml ng <br />up and down the slope. <br /> The C factor was determined based on the vegetation description 1n Tab 10 and with [he aitl <br /> of [he US OA-ARS reels ed USLE software program for each cover type within the overall <br /> drainage area. The P factor is based on current or future practice. Table 13-3-2 shows <br />• the weighted ave rage results for the C and P factors for the various s ubwatersheds. <br />Storage Capacity <br />The storage capacity was also analyzed using the SEUCAD+ computer program. Results of the <br />SEOCAD+ model show the storm runoff volume from the 10-year, 24-hour precipitation event <br />to be 18.3 ac-f t. The ponding area Ss designed to store 10.31 ac-ft of sediment. There <br />will be no discharge through the emergency spillway during the 10-year, 24-hour storm <br />event. In addition, there will be adequate freeboard from the emergency spillway to the <br />top of embankment during the 100-year, 24-hour storm event. <br /> <br />13-3-7 Revised 09/08/95 <br />