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<br />o <br />~ ., <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />There are nearly 500 gaging stations reported by the United States <br /> <br />Geological Survey, plus additional ones operated by local av.encies and water <br /> <br />users groups on the Colorado River and its tributaries in the Upper Basin. <br /> <br />Much of the water now diverted for agriculture in the Upper Basin serves <br /> <br />lands in mountain valleys and alluvial fans and terraces, all with appreciable <br /> <br />topographic variation. Hence, most of the unconsumed water diverted either <br /> <br />for use by small individual landowners or large canal companies or irrigation <br /> <br />districts returns to the river system through many natural drainage channels. <br /> <br />Very little accumulates in major drainage works. Much water returns to the <br /> <br />river system as subsurface runoff and is not readily measurable. <br /> <br />Such activities as the Comprehensive Surveys and the requirement <br /> <br />of Section 601(b) of the Colorado River Basin Bill are expected to provide <br /> <br />continuously more and better data on Upper Basin uses. <br /> <br />4 <br />