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<br />'. <br /> <br />r, <br /> <br />, <br /> <br />" <br /> <br />., <br /> <br />.. <br /> <br />.' <br /> <br />~ <br /> <br /> <br />, " <br />, 001137 <br /> <br />-5- <br /> <br />3. Estimated Water Supply <br />The Upper Colorado River Compact of 1948 allots to Colorado 51.75 <br />percent of 7,450,000'acre-feet (Upper Basin shar~ under Colorado Rive~ <br />Compact of 1922) minus 50,000 acre-feet awarded to Arizona. Colorado's <br />water supply thus reaches the total of 3,855,375 acre-feet. However, <br />water supply measurement$ for the years since 1930 indicate that, for <br />the present at least, the plans for the development of water uses in <br />.Colorado should be based ona smaller amount than that derived from the <br />. <br />, . <br />consideration of the Upper Colorado River Compact. <br />In 1953, the Colorado Water Conservation Board, under authority <br />of the State Legislature, employed a firm of nationally known engineers <br />, with long experience in irrigation water supply engineering to make a <br />study and report on the depletion of surface water supplies of Colorado <br />west of Continental Divide. This firm, Leeds, Hill and Jewett, reported <br />that the period 1930-1952 should be used to estimate the water supply <br />'inasmuch as the yield for this period was considerably less than the <br />\ <br />average over the period 1917-53. One of the conclusions reached in <br />this study was that Hthe total of all depletions at sites of use <br />- -- <br /> <br />(emphasis supplied) in Colorado of 'the ,flow of Colorado River and its <br />tributaries may thus be limited to 3,100,000 acre-feet per year.w This <br />~ppears to be a very conservative estimate inasmuch as this period covers <br />se~eral years 'of severe drought. There is every reason to believe that <br />the future yield's will more nearly approach the long-time average which <br />would give Colorado 3,855,375 acre-feet as ita share of Colorado River <br /> <br />water. <br />