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<br />complete service to some of the ditches rather than to provide <br />inadequate service for all. Ditches were therefore chosen, again <br />on an idea~ basis, whose average annual requirement just exceeded <br />the average annual new water reservoir yield. ' <br /> <br />Reuse of Participating Ditch Return Flow <br /> <br />Return flow from diversions of reservoir water will become <br />available for ditches physically located below the participating <br />ditches. This reuse was not studied in detail at the adjusted <br />historic level. Irrigation season demands were great enough to <br />redivert all of the return flow. To eliminate possible return <br />flow location errors, water was assumed to be rediverted by the <br />most downstream ditches. Winter flows were diverted to existing <br />offstream reservoirs if there was sufficient existing capacity. <br />In our studies it was assumed that no fUrther reuse could occur. <br /> <br />The next study undertaking was the intermediate time level <br />studies. <br /> <br />Intermediate Time Level Studies <br /> <br />Intermediate time level studies were made at the time that <br />the Denver Metropolitan Area will be fully utilizing their presently <br />decreed Blue, Williams Fork and Frasier River trans mountain diversion <br />rights. The time was determined as 1990. The studies involved a <br />determination of yield from Western Slope rights, population pro- <br />jections, per capita demands and municipal exchange. Because the <br />effect of future municipal imports will play a most important role <br />in the future of agriculture in the basin the derivation of time <br />and municipal effects will be discussed in some detail by the next <br />speaker. <br /> <br />The 1990 study procedure was quite similar to that of the <br />adjusted historic studies so rather than cover these procedures <br />again, we will explain the differences between the two studies. <br /> <br />Water Supply <br /> <br />The water supply in 1990 will be increased over that which was <br />available for agricultural diversion during the 1952 through 1957 <br />period. The increase will be due to municipal transmo~tain diversions <br />which will be eXplained later, the Colorado-Big Thompson Project and <br />the proposed Cache la Poudre Project. <br /> <br />26 <br /> <br />