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<br /> <br />U) <br />tV <br />I-" <br /><..0 <br /> <br /> <br /> <br />FIGURE 6. serious water erosion caused by excessive use <br />of irrigation water on too steep slopes. <br />Approximately 75 percent of the topsoil was lost in one <br />irrigation. Fremont county, Wyoming. Photo courtesy <br />Soil Conservation service, u.s. Dept. of Agriculture. <br /> <br />18 <br />