Laserfiche WebLink
<br />Co <br /> <br />- <br />- <br />c.. <br />C- <br /> <br />(b) Noncropped areas - The average 1914-1945 and average <br /> <br /> <br />1946-1951 consumptive uses by cities and towns were derived from <br /> <br />studies on annual bases. <br /> <br />The annual consumptive uses by farmsteads and other non- <br /> <br />cropped areas were determined from the average 1914-1945 and <br />1946-1951 uses by applying annual deviation factors computed as <br /> <br />the ratio of the annual use by crops to the average 1914-1945 <br />and average 1946-1951 annual use by crops in each irrigated area. <br /> <br />(c) Transbasin export diversions - Annual transbasin export <br /> <br />diversions were based on monthly records except export diversions <br /> <br />from the headwaters of the Virgin River for the Newcastle Project <br /> <br />in Utah. A few measurements formed the basis for estimating an <br /> <br />average annual diversion of 1,500 acre-feet for the Newcastle <br /> <br />Project since the start of diversions in 1921. Allowances were <br /> <br />made for variations in the water supply available for diversion <br /> <br />by assuming that annual exports would vary from the average of <br /> <br />1,500 acre-feet as one-half the deviation of the annual flow from <br /> <br />the average flow of the Virgin River at Littlefield. <br /> <br />(d) Reservoir depletions - Reservoir evaporation depletions <br /> <br />by the larger reservoirs were derived on an annual basis. Deple- <br />. <br /> <br />tions by the small reservoirs were varied in accordance with the <br /> <br />crop uses in the areas served by the reservoirs with consideration <br /> <br />for the period of reservoir operation. <br /> <br />Annual changes in sUI~ace storage in the larger reservoirs <br /> <br />were determined from records of the Geological Survey. <br /> <br />21 <br />