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d. White River near Watson. Utah - GS number -09306500. The gauge has <br />been in operation from 1904-1905, and from 1923-1995. The gauge is reflective <br />of the runoff from 4020 square miles above the gauge. The average annual runoff <br />past.the gauge is 501,600 acre-feet. <br />The records at the gauge are considered fair. The natural flow of river is affected <br />by irrigation for 31,900 acres above the gauge. The diversions should not have an <br />impact on the larger peak flows, for it is doubtful whether the diversions would be <br />in operation during large floods. <br />The annual peak flows vary from a high flow of 8160 ft3/s on July 15, 1994, to <br />the lowest annual peak of 1310 ft3/s on July 25, 1977. The earliest time that the <br />peak flow has occurred during any water year is February 18th (1986). The latest <br />the peak flow has occurred is September 22nd (1961). In general, the peak rate <br />of runoff occurs as the result of snowmelt with a large amount of the peaks <br />occurring in the month of May and early June. <br />Table 7 summarizes the recorded flows for the White River near Watson, Utah, <br />used in the analysis. Table 8 summarizes the results of entering the yearly peak <br />flows into the FREQY computer model, and letting the model compute natural <br />recurrence level flood peaks following the log Pearson Type III methodology, and <br />guidelines in Technical Bulletin 17B. <br />Figure 4 shows the peak natural flow frequency curve for the White River near <br />Watson, Utah. <br />17