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<br />'lJ~, '''''l CL~'l <br />l...._"-' .. <br /> <br />good. Sediment yield classification parameters are defined in the <br />following table: <br /> <br />SEDIMENT YIELD <br /> <br />TYPE OF EROSION <br />Severe <br /> <br />DEFINITION <br />Stream banks or gullies with average depth of <br />5 feet (1.5 km) or more and having a sediment <br />yield of ~. 0-2.0 acre feet/bank mile/year <br />(770-1530 m /bank km/year) <br /> <br />Very High 1 :f-3. 2 acre feet/square mile/year (480-1430 <br /> m /km / year) <br />High 03>-1.2 acre feet/square mj Ie/year (240-480 <br /> m /km / year) <br />Moderate o -j-O. ~ acre feet/square mi Ie/year (100-240 <br /> m /km /year) <br />Low 031-0.~ acre feet/square mile/year (50-100 <br /> m /km /year) <br />Very Low less than 30.1 z3cre feet/square mi Ie/year (less <br /> than 50 m /km /year) <br /> <br />Naturally high yields have been increased by overgrazing in the <br />lower zones, and the arid climate has inhibited regeneration of the <br />vegetation cover. As shown in figure 2-4, areas of both moderate <br />and high sediment yield exist in the study corridor. <br /> <br />Vegetation <br /> <br />, <br /> <br />A wide range of cover conditions exists, making this an area of <br />great ecological diversity. In addition to irrigated and dry <br />farmland, there are five major vegetative types present (see figure <br />2-5), Of these, approximately 52 percent of the pinyon-juniper- <br />sagebrush, 37 percent of the salt desert shrub, 10 percent of the <br />ponderosa pine-scrub oak, and 1 percent of the spruce-fir types <br />have been converted to irrigated farmland. These altered lands <br /> <br />23 <br />