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higher elevations in the Roan Plateau. The canyons at the site <br />a are not of sufficient size to affect the general air masses and <br />cause large variations in precipitation. <br />a) Seasonal variation <br />Six precipitation gauges were operated within the project <br />site for periods of up to five years (1970-1974). Based <br />on the data collected, the normal annual precipitation at <br />the project site was measured at 16 inches. The distribution <br />of normal precipitation (in inches) is summarized as follows: <br />Jan Feb Mar ~ M~ Jun Jul Aug Seg Oct Nov Dec <br />1,58 1.15 1.28 1.18 1.29 1.15 1.05 1.79 1.17 1.59 1.25 1.52 <br />The distribution of monthly precipitation demonstrates that <br />• the precipitation throughout the year is fairly uniform, with <br />the winter season receiving slightly more precipitation than <br />the summer. June and July receive the least precipitation <br />during the year. About one-half of the annual precipitation <br />is received in the form of snow. <br />Precipitation records from the six site stations and four <br />regional National Weather Service (NWS) stations, selected <br />for their apparent hydrometeorological homogeneity and <br />proximity to the project site, were summarized for the <br />five-year period of record. Table R-1 presents the monthly <br />totals compiled from the daily records. <br />b) Rainfall Intensities <br />Rainfall depth-duration-frequency data were developed for <br />the site. Selected data for the Upper Parachute Creek basin <br />. are given below: <br />R-3 <br />