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_I' 074.9 TRANSIT LOSSES AND TRAVEL TIMES FOR RESERVOIR RELEASES, UPPER ARKANSAS RIVER BASIN, COLORADO By Russell K. Livingston ABSTRACT Factors influencing reservoir releases were analyzed for the upper reach of the Arkansas River in Colorado, The time of travel of releases from Twin Lakes Reservoir to Colorado Canal, a distance of 175 miles, ranges from 29 to 69 hours depending on the antecedent flow of the Arkansas River, Travel time of releases from Turquoise Lake is 4~ hours more and travel time of releases from Clear Creek Reserv~ir is l~ hours less than for the Twin Lakes Reservoir to Colorado Canal reach. . At the Colorado Canal, the streamflow hydrographs resulting from upstream reservoir releases are modified by channel and bank storage, inadvertent diversions, and evapotranspiration. During an average reservoir release of about 450 cubic feet per second for about 12 days, the released water arriving at the Colorado Canal is reduced by about 7 percent due to bank storage, by about 8 percent due to inadvertent diversions, and by about 1 percent due to evaporation. All release water in channel storage arrives at the Colorado Canal headgate during the release recession soon enough to be diverted and does not cause a loss, Transpiration losses due to bank storage are assumed to be negligible. This total average transportation loss of 16 percent can vary from about 6 to 28 percent due to the antecedent river conditions, the amount and duration of the reservoir release, and the time of year the release occurs. INTRODUCTION As a result of the nation's rapidly growing population, increasing use of water for industrial and agricultural purposes, and the legal demands of interstate water compacts, efficient water utilization is becoming increasingly important. This situation has led to a need for more precise information with regard to the administration and manage- ment of water. . 1