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<br />002~~2 <br /> <br />. <br /> <br />Evaporation rates were calculated by a formula, developed by <br /> <br />the Engineering Department of the Co lorado Water Conservation Board, <br />applicable to the climatic conditions of the territory, Accuracy of the <br />formula has been checked against rates observed at an evaporation pan <br /> <br />maintained by the Colorado Water Conservation Doard, at or near the sed- <br /> <br /> <br />imentation basins of the Pueblo Water ~rorks. <br /> <br /> <br />A picture of reservoir operations is available from comparisons <br /> <br /> <br />of the records of total reservoir supplies and total releases. Most of <br /> <br />the supplies are measured and recorded. These include the deliveries <br /> <br />by the A.V.C. and the diversion-deliveries via the flood ditch from the <br />St. Charles River. Local runoff from the drainage area of Salt Creek <br /> <br />and rainfall on the reservoir surfaces necessarily involves some esti- <br /> <br />mations. Releases from the reservoirs are neasured in the 48" and 27" <br /> <br />pipe lines leading to the steel plllt. <br />Overall reservoir losses, calculated as the difference between <br /> <br />inflows and outflows, takinG into account the changes in reservoir oon- <br /> <br />tent, include losses both by evaporation and seepage. Segreation as be- <br /> <br />tween the two forms of v'"-ter losses were made by calculating the evapora- <br /> <br />tion 10 ss as the product of the exposed water s" rface areas and the ap- <br /> <br />plicable evaporation rates. By deductinG the evaporation loss from the <br /> <br />total reservoir loss, the remai nder is considered to be the seepage loss, <br />most of which is visible and subject to observation and measurement in <br /> <br />Salt Creek. <br /> <br />Principal sources of the plant supplies are the several reser- <br /> <br />voirs. These are augmented, at times, by deli vories to the plant via <br /> <br />(d) <br />