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<br />r~ <br />aggrading (accumulating sediment) with an excellent <br />protective plant cover and little or no channel develop- <br />went. Also, existing reservoirs act as sediment traps. <br />Estimated sediment yield from these tracts using the <br />Pacific Southwest Inter-agency Committee (1968) method <br />is about 200 tons/sq-mi (tons per square mile) (Table <br />5). <br />Tracts C-22676 east and west are somewhat less stable. <br />Both are characterized by southwest-facing slopes that <br />do not have as well developed soils or as good a plant <br />cover as the tracts described above. Dryland farming <br />in and adjacent to the western tract also is a factor <br />that increases erosion and sediment yield. Sediment <br />yield from these tracts is estimated to be about 300 <br />tons/sq-mi (Table 5). <br />5. Alluvial Valley Floors <br />No alluvial valley floors as defined in Public Law <br />95-87 and regulations promulgated thereto occur within <br />or adjacent to proposed tracts C-22644 and C-26913. <br />Both east and west tracts of proposed lease C-22676, <br />however, include small segments of alluvial valley <br />floors. <br />The extreme southwest corner of the eastern tract <br />covering an area of about 0.6 acre lies on the alluvial <br />47 <br />