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<br /> <br />Hoover Dam Inflow <br /> <br />26,656,000 <br /> <br /> <br />Table 4.4.--Summary of 100-year base snowmelt flood <br /> <br />Volume <br />(acre-feet) <br /> <br />Glen Canyon Dam Inflow <br />Intervening Inflow <br /> <br />25,375,000 <br />1,281,000 <br /> <br />4.4 MONTHLY INFLOWS TO MAJOR UPPER BASIN RESERVOIRS <br /> <br />Snowmelt inflows to other reservoirs in the upper basin were also <br />developed. A simplified approach was chosen for distributing a <br />portion of the inflows to Glen Canyon to the upstream reservoirs. <br />Base snowmelt flows were calculated using a ratio of the average <br />annual runoff at the upstream point to the average annual runoff at <br />Glen Canyon using 1906-1986 CRSS data. Snowmelt inflow hydrographs <br />were developed for Blue Mesa, Crystal, Fontenelle, Flaming Gorge, <br />and Navajo Reservoirs. <br /> <br />Natural flow data were compiled from the CRSS data base for the <br />1906-1983 period and from provisional CRSS data for the 1984-1986 <br />period. The average monthly flows at the stations of concern in the <br />Colorado River basin along with the monthly flow distribution <br />percentages are shown in table 4.5. Table 4.6 shows the ratio of <br />the average annual flows at the reservoirs of concern to the flows <br />at Glen Canyon Dam. The ratios were applied to the 100-year base <br />snowmelt flood into Glen Canyon to obtain the base snowmelt flood at <br />each reservoir. <br /> <br />A comparison of 1906-1986 monthly flow distributions versus the 1984 <br />actual CRSS monthly flow data indicated good agreement. Therefore, <br />the 1906-1986 monthly distributions were used to calculate the <br />monthly 100-year base snowmelt flood flows for the stations upstream <br />from Glen Canyon. The results are presented in tables 4.7 and 4.8. <br /> <br />56 <br />