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J <br />' East Slope Storms <br />' The historic storms of this type considered in the Williams Fork study are still the <br />largest in the historical record. These stows produce their heaviest rainfall east of the <br />Continental Divide with lesser amounts over regions immediately to the west of the Divide. <br />' These storms turned out to be insignificant for the Williams Fork basin. Since the rainfall <br />produced by these storms is confined to the eastern portion of the Williams Fork basin, they are <br />' even less significant for the Henderson Mill drainage basin. The most significant storm of this <br />type is the transpositioned Glacier Park storm. The transpositioned and maximized is~heytal <br />pattern is presented in Figure 6. Very small rainfall amounts extend westward over tt~e <br />' Continental Divide with insignificant amounts over the Henderson Mill drainage. Hence this type <br />of storm is not considered to be capable of producing a PMP event at the Henderson Mill <br />t location. <br />' Moist Southwest Flow Events <br />This storm has the greatest opportunity to produce large rainfall over t~asins in the <br />high Rockies because of the availability of significant amounts of moisture being brought in from <br />' the Pacific Ocean to the southwest. The storms evaluated in the Williams Fork are still the largest <br />in the historical record. These storms of this type which produce large rainfall totals occur to the <br />' southwest of our area of interest. Any well organized moist flow with a strong southerly <br />component encounters major mountain barriers as it intrudes into the southwest. The largest of <br />these events were maximized and transpositioned over the Williams Fork basin. The isohyetal <br />patterns from these storms have been influenced by the upwind barrier effects of the Gore and <br />William Fork Ranges. The storm centering was matched as closely as possible the relationship of <br />' the rainfall center with the topography. The most significant maximized and transpositioned <br />isoheytal pattern resulted from Bug Point center of the September1970 storm. The is~~heytal <br />' pattern is presented in Figure 7. <br /> <br /> <br /> <br />t <br />Page 13 <br />1 <br />