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<br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Exports <br /> <br />o <br />':-) <br />~ <br />~ <br />~ <br />N <br /> <br />The vast majority of the water exported from the Colorado River System is <br /> <br />gaged and reported on by the Geological Surveyor water user organizations. <br /> <br />The small remainder will be estimated on the basis of past records or size of <br /> <br />facilities. <br /> <br />Evaporation <br /> <br />A comprehensive listing of all reservoirs in the Colorado River was <br /> <br />developed for the last report. This listing included information about <br /> <br />major reservoir use, location, elevation, total capacity, and surface area at <br /> <br />total capacity. The listing is being cross checked against the 1975 national <br /> <br />inventory of dams prepared by the Corps of Engineers. <br /> <br />Monthly content records will be obtained for those reservoirs for which <br /> <br />records are available. The average annual water-surface area will be determined <br /> <br />for each year of the reporting period. For those reservoirs lacking records, <br /> <br />a "fullness factor" will be estimated on the basis of reservoir use and <br /> <br />historical hydrologic conditions. These "fullness factors" will then be used <br /> <br />to obtain estimates of average annual water-surface area for the unreported <br /> <br />reservoirs. <br /> <br />Regression equations relating gross annual reservoir evaporation to <br /> <br />elevation, latitude, and geographic location will be developed for each <br /> <br />of the reporting years. Account will be taken of precipitation and runoff <br /> <br />salvage to determine net evaporation rates. The net evaporation rates will be <br /> <br />applied against the estimates of average annual water-surface area to yield <br /> <br />the values of annual reservoir evaporation. <br /> <br />Main Stem and Mainstream Reservoir Evaporation <br /> <br />For the main stem reservoirs in the Upper Basin monthly evaporation <br /> <br />rates computed from recorded monthly meteorological data will be app~ied <br /> <br />13 <br />