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<br />i~ <br />;~ <br />Doc Date:12/71/2pp- ~ ~ III'll'IIIIIIIII'11 <br />5j~ <br />2.7.6 Hydrologic Balance <br />A discussion of the hydrologic balance of the permit area follows. <br />Precipitation, evapotranspiration, surface runoff and ground-water <br />recharge are considered in this water balance. <br />2.7.6.1 Precipitation <br />The climate in the region is semi-arid. Since 1936, annual precipitation <br />at Craig has averaged approximately 13 inches and has varied from a <br />minimum of 7.4 inches to a maximum of 20.8 inches. The maximum monthly <br />precipitation occurred in October 1941 and June 1945 when 4.55 inches <br />were recorded: No precipitation was recorded during October 1952. <br />Point precipitation data for various projected storm occurrences were <br />obtained from U. S. Weather Bureau records and SCS estimation procedures. <br />Precipitation values for different frequencies are given in the following <br />tabulation. <br />AVERAGE <br />FREQUENCY <br />PRECIPITATION <br />OCCURRENCE <br />Mean Annual 0.44 0.90 1.1 <br />10-year 0.64 1.3 1.7 <br />25-year 0.78 1.6 2.0 <br />50-year 0.83 1.7 2.2 <br />100-year 0.93 1.9 2.5 <br />Probable PSaximum 5.9 12 21 <br />Average monthly values of precipitation are given in Table 2.7-23. <br />ONE-HOUR <br />POINT <br />PRECIPITATION <br />(Inches) <br />SIX-HOUR <br />POINT <br />PRECIPITATION <br />(Inches) <br />24-HOUR <br />POINT <br />PRECIPITATION <br />(Inches) <br />2-525 <br /> <br />