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The C and P Fa cto ra. The C factor, the cover and management factor, !s the ratio of soil <br />loss from an area with specified cover and management to that from an Sden tical area in <br />tilled continuous fallow. <br />The P factor, the support practice factor, is the ratio of soil lose with a support <br />practice like contouring, strip cropping, or terracing to that with straight-row farming <br />up and down the slope. <br />The C factor was determined with the aid of the USDA-ARS revised USLE softxare program for <br />each cover type with the overall drainage area. The P factor Ss based on current or <br />future practice. The CP factors were then "weighted" for each subwate rshed as shown Sn <br />Addendum 3. <br />Storage Capacity <br />The Phase III design/as-built storage capacity of Sediment Pond 006 was also analyzed <br />using the SEDCAD+ computer program, Table 13-4C-2 Ss a summary of the designed storage <br />capacity. Results of the SEDCAD+ model show the storm runoff volume from the 10-year, 24- <br />hour precipitation event to be 12.7 ac-ft. The ponding area is designed to store 12.9 ac- <br />ft of sediment. There will be no discharge through the emergency spillway during the 10- <br />year, 24-hour storm event. In addition, there will be adequate freeboard from the <br />emergency spillway to the top of embankment during the 100-year, 24-hour storm event. <br />TABLE 13-4C-2 <br />Phase III Design/AS-Built Storage Capacity Summary <br />Pond 006 <br />Capacity <br />Elevation Staoe (AC.-Ft.) <br />7050 0 0.00 <br />7068.0 18.0 12.9 <br />7070.7 20.7 17,5 <br />7070.8 20.8 17,7 <br />7073.3 23.3 22.9 <br />7078.8 28.6 N/A <br />Description <br />Bottom of Pond Excavation <br />1006 Sediment Storage, and 4' <br />diameter orl fire principal <br />spillway <br />10-yr, 24-hr Peak Stage <br />Crest of Emergency Spillway <br />100-yr, 24-hr Peak Stage <br />Top of Embankment <br />i <br />• <br /> <br />6 Revised 09/2B/95 <br />