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<br />~ <br />~ <br />~ <br />00 <br /> <br />the specific volumes of runoff, sediment, and salt <br /> <br />resulting from several different levels of trampling <br /> <br /> <br />by cattle on a saline soil having two different levels <br /> <br /> <br />of plant cover. <br /> <br /> <br />A long-term research project is being planned on <br /> <br /> <br />a site 13 miles north and west of Green River, Utah, in <br /> <br />the highly eroded Mancos shale hills lying just west of <br />the Book Cliff. It is planned that water quality gaging <br />instruments will be installed on at least two small basins <br />(500 to 600 acres) to determine the volume of runoff, sed i- <br /> <br />ment, and salt yield under varying natural conditions. <br /> <br /> <br />Other basins may also be instrumented if money becomes <br /> <br />available. <br /> <br />This research is directed at determining <br /> <br />the effects of trampling by livestock and grazing treat- <br /> <br />ments on salinity yield. <br /> <br />Information on specific means of controlling <br /> <br />salinity in surface runoff by management of grazing <br /> <br />animals has been incorporated into a current revision <br /> <br />of BLM's grazing manual. <br /> <br />The BLM manual is being <br /> <br />published and will be distributed to all offices. <br /> <br />-20- <br />