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<br />..... <br /> <br />} . <br /> <br />) <br /> <br />located in the southern flood plain of the White River approximately. 18 <br /> <br />, <br /> <br />miles upstream from the Colorado-Utah State line, at about 5200 feet, m.s.l. <br /> <br />) (See Chart 3). Local area runoff originates from washes and small ravines <br /> <br />south of town. <br /> <br />I <br /> <br />I CLIMATOLOGY <br /> <br />The climate is highly variable over the basin, being semi-arid with <br /> <br />}~ <br />;' <br /> <br />relatively warm summers and cold winters. Extremes are due largely to the <br /> <br />wide range of elevation and exposure. The mean annual temperature at Ral1gely <br /> <br />is about 460 F with extremes of -370 F to 1060 F. Average annual precipitation <br /> <br />varies from 50 inches in the headwaters of the basin to less than 10 inches <br /> <br />at Rangely. See next page for a mean monthly temperature and precipitation <br /> <br />distribution graph for Rangely, and see Chart 4 for the NAP map. Higher <br /> <br />irrigated lands above Buford have frost free periods of less than 50 days, <br /> <br />while the lower valley near Rangely averages abo~t 124 days. <br /> <br />") <br />) <br /> <br />Precipitation is fairly uniform during the year, as can be seen from <br /> <br />the plot of monthly precipitation. Almost 40 percent of the annual precipitation <br /> <br />occurs during the late summer period of August through October. Accumulated <br /> <br /> <br />) winter snow is the principle source of stream flow. Summer rainfall (July-October) <br /> <br />generally occurs as convective thunderstorms. These summer storms are characterized <br /> <br />by high peaks, short flow durations, and low volumes. <br /> <br />2 <br />