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4-17 <br />average yearly runoff is about 4,490 acre-feet. This repre- <br />• sents less than one-half inch of runoff from the 197 square <br />mile drainage basin, which is to be expected from this area <br />of low precipitation which has an average annual potential <br />evapotranspiration of about 24 inches (Geraghty, 1973). <br />Peak discharges, however, generally occur during the summer <br />and fall months as the result of high intensity, short dura- <br />tion thunderstorms. Peak discharges are discussed in more <br />detail in Section 4.3.4.1. <br />The seasonal fluctuation of flows at the site near Munger <br />Creek would be expected to be similar to those at the gauging <br />station. Applying a simple ratio of drainage areas, 56 percent <br />of the flows at the gauging station would occur at the site. <br />Although there are local variations in the effects of drainage <br />area and alluvial streambed characteristics, this direct <br />areal relationship provides the most reasonable estimate of <br />• flow conditions at the site. Monthly tabulations showing <br />estimated minimum, average and low flows are given in Table <br />4.3-75. <br />The maximum average monthly flow occurs in May and is esti- <br />mated for East Salt Creek near Munger Creek to be 23.2 cfs; <br />the minimum average flow occurs in January and is 0.1 cfs. <br />The average discharge is about 3.5 cfs. Estimated average <br />yearly volume is 2,560 acre-feet. <br />Discharge measurements have been made on East Salt Creek <br />at Douglas Pass road approximately two miles downstream <br />of the site and upstream of McClane Canyon. The measure- <br />ments are shown on Table 4.2-95. <br />9.3.2.1 Site Surface Water Drainage Characteristics <br />The central facilities are located on the east side of East <br />. Salt Creek, the major drainage system, as shown on Figure <br />