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<br /> <br />Fontenelle <br />Flaming Gorge <br />Blue Mesa <br />Navajo <br />Lake Powell <br />Lake Mead <br />Lake Mohave <br />Lake Havasu <br /> <br />200,000 <br /> <br />3,200,000 <br />545,000 <br /> <br />1,550,000 <br /> <br />22,600,000 <br /> <br />24,550,000 <br /> <br />1,582,000 <br /> <br />539,100 <br /> <br /> <br />6,3 RESERVOIR ROOTING OF lOO-YEAR SNOWMELT FLOOD <br /> <br />Using the 100-year depleted snowmelt flood values, two routing <br />studies were performed to simulate reservoir operations during the <br />antecedent flood event. The studies were conducted by the Upper and <br />Lower Colorado Regions using :flow information provided by the Denver <br />Office. The first analysis was a bimonthly routing of the flood <br />through the upper and lower basin reservoirs. The second was a <br />daily routing through Lake Powell and Lake Mead during the period of <br />peak inflow. <br /> <br />Several spreadsheets were designed to simulate the monthly planning <br />model, CRSS, used in Colorado River operations. This model is <br />updated bimonthly in response to National Weather Service runoff <br />forecasts. The Colorado River system operation was modeled <br />bimonthly beginning January 1st to reflect proper operations during <br />a forecasted 100-year snowmelt flood. Runoff forecast errors were <br />subtracted from the actual inflows through July 31 in order to make <br />operational decisions that reflect a reasonable degree of <br />conservatism. <br /> <br />The spreadsheets include the operation of eight reservoirs. For <br />each time period, the reservoir system was operated to fill each of <br />the reservoirs by the end of the runoff period while preserving as <br />much additional release capability as possible for later in the <br />spring. All of the reservoirs had evaporation losses removed from <br />storage. Lake Powell and Lake Mead operations accounted for changes <br />in bank storage. Table 6.2 displays the initial storage conditions <br />on January 1 which were used in this study. <br /> <br />The initial Lake Mead storage condition was chosen to achieve a <br />total system space of approximately 5.35 million acre-feet, which <br />represents a realistic starting point under full reservoir <br />conditions. Initial storage conditions for Lakes Mohave and Havasu <br />were taken from their respective operating rule curves. <br /> <br />Table 6.2.--January 1 reservoir storage capacities <br /> <br />Reservoir <br /> <br />Storage <br />(acre-feet) <br /> <br />72 <br />