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TABLE II.C-7 <br /> Average annual sediment yield estimate of the lease and <br /> adjacent areas using the PSIAC method. <br /> Surface Geology Massive, fine-grated sandstone <br /> interbedded with shales, well weathered. <br /> Soils Moderate shrink-swell potential, loamy, <br /> occasional rock fragments. <br /> Climate Infrequent convective storms <br /> Runoff High peak flow, low runoff volume per <br /> unit azea. <br /> Topography Moderate slopes, moderate flood plain <br /> development. <br /> Ground cover Cover not exceeding 40 percent, little or <br />• no litter, some rock fragments. <br /> Land use Moderate grazing, extensive road <br /> construction. <br /> Upland erosion Moderate rill and gully erosion. <br /> Channel erosion Moderate sloughing, medium flow <br /> duration, moderate flow depths. <br /> Total <br />Sediment yield (from Figure II.C-22) = 0.60 AF/miZ/yr <br />u <br />7 <br />5 <br />5 <br />5 <br />10 <br />0 <br />5 <br />10 <br />10 <br />57 <br />Permit Renewal ll3(Rev.8/99) II.C-44 <br />