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<br />(: <br />0; <br />c <br />... <br /> <br />,'- <br /> <br />III. <br /> <br />WATER RESOURCES <br /> <br />c <br /> <br />The cornerstone for planning any water resources program is the availability of water. The <br />water resources in the Eagle and Piney River basins were evaluated by applying proven techniques <br />for the compilation and evaluation of hydrological, climatological, and water use records. The <br />hydrological records for the stream gaging station at Redcliff on the Eagle River date back to the <br />year 1911. Water use appropriations on the Eagle and Piney River basins date back to the 1800's <br />and include over 750 separate appropriations. These data were used in a mathematical model <br />to estimate the virgin, or undepleted, flows in each basin for the historical period. The flows were <br />then extended by using statistical procedures. This "synthetic" hydrology provided a firmer basis <br />for forecasting minimum and maximum runoff flows than could be achieved by simply using <br />historic flows. <br /> <br />A mathematical model was then used to simulate the operation of water withdrawals and <br />return flows in the Eagle and Piney River basins for a particular set of assumptions regarding water <br />use by present and potential water users. This procedure resulted in an array of estimated water <br />quantities available to the Board's appropriations. <br /> <br />Another mathematical model to simulate the operation of the structures was developed to <br />determine the most efficient operation and its effects on water delivery. By operating this model, <br />using a high speed computer and performing a cost-water delivery analysis, the structural <br />capacities and corresponding average annual water delivery were estimated for each <br />configuration. <br /> <br />Differences in water delivered between the Eagle-Piney configuration and the other three <br />configurations is primarily due to the capability of the other three configurations to incorporate <br />both the Board's 1956 and 1971 appropriations, whereas the Eagle-Piney configuration can <br />integrate only the 1956 appropriations. <br /> <br />7 <br />