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4-16 4.3.2 Site Specific Surface Water Hydrology . The central facilities are to be located in the East Salt Creek valley near the mouth of Munger Creek. The site loca- tion is shown on Figures 2.2-15 and 4.3-15. Munger Creek is located in Section 29, Township 7 South, Range 102 West as shown on the United States Geological Survey (USGS) Howard Canyon 7.5 minute quadrangle map. Munger Creek is approxi- mately 16 miles upstream of the confluence of East and west Salt Creeks and approximately 20 miles upstream of the con- fluence with the Colorado River. Munger Creek, McClane Creek and other tributaries in the vicinity of the site are ephemeral channels, at times flow- ing into East Salt Creek. East Salt Creek is an intermittent stream near the site and a perennial stream in its lower reaches at the gauging station. The East Salt Creek drainage area below Munger Canyon is approximately 111 square miles. A summary of drainage areas of interest is presented in Table • 4.2-85. USGS has operated a recording station at East Salt Creek approximately five miles above the confluence with West Salt Creek since 1973. The drainage area at the gauge is about 197 square miles. Records from this station are included as part of Appendix Ds to this report (USGS, 1981). Although the short period of record (1973 - 1980 Water Years) is too short to obtain statistically reliable data, there are several general inferences that may be drawn from the data. East Salt Creek experiences the major volume of runoff in April, May and June in response to snowmelt. Figure 4.3-25 shows that May is the month of highest average volume with 56 percent of the total average yearly runoff. Low flow periods are experienced in winter months, with January contributing • less than one percent of the average yearly runoff. The