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<br />N <br />~ <br /><.0 <br />W <br /> <br />Geological Survey <br />The Geological Survey's Water Resources Division <br /> <br />provides and analyzes hydrologic information to assess the <br /> <br />Nation's water resources. <br /> <br />Programs are developed with <br /> <br />cooperation and financial support from state, local, and <br /> <br />other federal agencies. The programs provide hydrologic and <br />geochemical information for evaluation of surface and ground <br />water systems as well as for management and policy decisions. <br />To provide information required by the federal, state, <br /> <br />and local agencies to address Colorado River water quantity <br />and quality problems, the Water Resources Division operates <br /> <br />and maintains a network of 680 stream gaging stations and 200 <br /> <br />quality stations in the Colorado River drainage basin. <br />Streamflow and water-quality information from these stations <br /> <br />provide input to the hydrologic data base for Reclamation's <br />Colorado River Simulation System. <br /> <br />In addition to collecting hydrologic data, the Water <br /> <br />Resources Division has conducted a number of specific studies <br /> <br />related to salinity. These include: 1) long-term salinity <br />trends and man's influence on salinity, 2) methods of <br /> <br />estimating subsurface return flow in the lower Colorado <br /> <br />River, 3) areal imagery techniques for estimating consumptive <br /> <br />use, and 4) <br /> <br />effects of reservoir development and local <br /> <br />mining on salinity on selected tributaries of the Colorado <br /> <br />River. <br /> <br />-17- <br /> <br />,i,,_, <br />