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<br />002336 <br /> <br />as the optimum mixture of various uses (or the single use) of land based upon <br /> <br />relative values and potentials of various resources, as well as the compatibility <br /> <br />of their uses. <br /> <br />The greatest contribution of BLM toward better water management will <br /> <br />be to manage the vegetative resources,in a manner that will maximize water <br /> <br />. yields and minimize sedimentation and pollution. To this end 66 community <br /> <br />watersheds have been delineated to faCilitate planning and development. Sub- <br /> <br />stantial progress has been made in two watersheds involving an expenditure of <br /> <br />$300,000 by BLM. Planning has been undertaken, along with a small amount <br /> <br />of development work, in 5 watersheds,' which will, when the program is im- <br /> <br />plemented, involve a total cost on BLM lands of about $8,000; 000. <br /> <br />PART Il--STUDY AREA <br /> <br />A. Topography and vegetation <br /> <br />The vast area which constitutes that portion of th~ Lower Colorado River <br /> <br />watershed below Lees Ferry may be broadly categorized into three distinct <br /> <br />physical areas--each with its own more or less individual climate, flora, and <br /> <br />. <br /> <br />fauna. <br /> <br />The northern section, which includes portions of the Colorado Plateau <br /> <br />and Basin and Range Provinces, is characterized by lofty plateaus incised by <br /> <br />spectacular canyons with remnants of hills, buttes, and mesas. The plateaus <br /> <br />differ from one another in temperature, rainfall, and vegetation. The average <br /> <br />elevation of the area is 5,000 to 7, QQO feet. . Much of the area is wooded, with <br /> <br />6 <br /> <br />