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• The C and P Factors The C factor, the cove[ and management factor, is the ratio of soil <br />loss Erom an area with specified cover and management [o [hat from an identical area in <br />tilled continuous fallow. <br />The F fae[er, the support practice fa cter, is [he ra tie of soil loss with a support <br />oractice like contour na, strip trooping, er ie[raci na to that with stralaht-tow farming <br />up and down the slope. <br />The C tactor vas determined based on the veq et ation description in Tab 10 and with the <br />aid of the USDA-AFS revised USLE softwar=_ prog [am for each cover type within the overall <br />drainage area. The F factor is based on current or future practice. Table 13-4A-4 show <br />the weighted average results for the C and P factors for the various subwatersheds. <br />TABLE 13-4A-4 <br />CP Ea ctor <br />Pond 011 As- Built <br />• Vegetation ?ype CP Area (ac.; <br />Spoil 0.496 33. 30 <br />Undisturbed 0.113 10"7 .51 <br />Storage Capacity <br />The storage capacity was also analyzed us inq the SEDCr.Da computer program. Results cf <br />[he SEDCAD` model show the storm runoff volume from [t,e 10-year, 24-hour precipitation <br />event in be _.54 ac-ft. The ponding area is designed Co store 3.P ac-ft of sediment. <br />There will he no discharge through the emergency spil l•day during the 10-year, 24-hour <br />storm event. In addition, there will be adequate freeboard from the eme rq ency spillway <br />to the [op of embankment dun ny [he 100-year, 24-hour storm event. Table 13-4A-5 is a <br />summary of [he as-built storage capacity. <br /> <br />13-4A-7 Revised 11/12/?~ <br />