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f. San Rafael River near Green River Utah - GS number - 09328500.. The <br />gauge has been in operation from 1909-1918, and from 1946-1995. The gauge is <br />reflective of the runoff from 1628 square miles above the gauge. The average <br />annual runoff past the gauge is 104,800 acre-feet. <br />The records at the gauge are considered good. The natural flow of river is <br />affected by irrigation for 42,000 acres above the gauge, transbasin diversions for <br />irrigation in the Sevier River basin, and some storage at Joes Valley Dam (54,610 <br />acre-feet) since 1965. <br />The annual peak flows vary from a high flow of 12,000 ft3/s on September 2, <br />1909, to the lowest annual peak of 107 ft3/s on September 16, 1976. The <br />earliest time that the peak flow has occurred during any water year is March 30th <br />0979). The latest the peak flow has occurred is September 22nd (1962). In <br />general, the peak rate of runoff occurs as the result of rainstorms with a large <br />amount of the peaks occurring in the summer months. <br />Table 11 summarizes the recorded regulated flows for the San Rafael River near <br />Green River, Utah, used in the analysis. Table 12 summarizes the results of <br />entering the yearly peak regulated flows from 1965-1995 into the FREQY <br />computer model, and letting the model compute natural recurrence level flood <br />peaks following the log Pearson Type III methodology, and guidelines in Technical <br />Bulletin 176. <br />Figure 6 shows the peak regulated frequency curve for the San Rafael River near <br />Green River. <br />26