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<br />July 1996 CYVCC - Sediment Yield Demonstration Rev.1- Block C 16 <br />Soil Erodibility Factor, K. The K factor for Block C was determined using a weighted average of the <br />pre-disturbance soil types found in Block C and adjacent areas. Based on Routt County SCS <br />designations, pre-disturbance soil types have the following K factors: <br />Winevada-Splitro Complex K = 0.20 <br />Aaberg Silty Clay K = 0.32 <br />Cochetopa Loam K = 0.28 <br />The weighted average K factors is 0.22. K factor calculations can be found in Appendix A. As <br />previously stated the soils found in Block C are similar to the soil found in adjacent pastureland areas, <br />therefore, the K factor for areas should not vary significantly when compared to the K factor for Block <br />C. <br />Representative Slope Length. The slope length is representative of the typical slope length over the <br />subwatershed and was determined as the distance from the point of origin of overland flow to the point <br />where the slope decreases such that significant deposition occurs or until flow enters a defined channel. <br />Average Slope. The average slope is entered in percent and is the typical or representative slope for <br />overland flow for each subwatershed. Average slope was also measured directly from the 1 "=500' scale <br />figures for both areas. As previously mentioned, for this study the same topography is used for both <br />areas. <br />Control Practice Factor. The control practice (CP) factor is defined as the ratio of sediment loss from <br />an area with a given cover and conservation practice to that of a field in continuous fallow. <br />Using Table S.Sc CP in the SEDCAD+Users Manual: <br />Block C <br />Type and Height of Raised Canopy: No Canopy <br />Canopy Cover: 0 <br />Percent Ground Cover: 92.5 % (Percent cover includes litter and rocks) <br />CP:.0047 <br />Adjusted CP:.0024 or .003 <br />Pastureland Reference Area <br />Type and Height of Raised Canopy: No Canopy <br />Canopy Cover: 0 <br />Percent Ground Cover: 97 <br />CP:.003 <br />a~vu~arxc~ucr~eev <br />°wswe r3~om,~ Terrahfatris Ine • 765 South Union Boulevard. Suite 460 ' Laknvood, Colorado 80128 ' (303) 763-Sr~O <br />