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• TABLE 7-6 <br />Calculation of Potential Evapotranspiration for the Period <br />July 1979 through June 1980, Seneca tl-W Mine, Routt County, Colorado <br />Blaney-C ri ddle Equation: <br />PET = K <br />100 <br />PET = Potential Evapotranspiration in inches <br />K = crop use coefficient = 0.60 annually or = 0.70 monthly <br />t = mean monthly air temperature in °F <br />p = percent of annual daytime hours at any particular latitude <br /> 3 <br /> Total Precipitation <br /> 1 2 <br />Month and Year t p tp/100 (inches) <br />July 1979 63.5 10.25 6.51 0.98 <br />Aug. 1979 60.8 9.56 5.81 2.79 <br />Sept 1979 56.3 8.39 4.72 0.21 <br />Oct. 1979 42.4 7.74 3.28 2.93 <br />Nov. 1979 20.9 6.70 1.40 1.93 <br />Dec. 1979 14.7 6.48 0.95 0.59 <br />Jan. 1980 16.5 6.70 1.11 4.18 <br />Feb. 1980 21.1 6.72 1.42 2.00 <br />Mar. 1980 24.1 8.32 2.00 2.25 <br />Apr. 1980 36.8 8.97 3.30 0.90 <br />• <br />May 1980 47.4 10.05 4.76 2.88 <br />June 1980 58.5 10.10 5.91 0.02 <br /> Sum 41,17 Sum 21,66 = 1.81 ft. <br />PET annual = 0.60 x 41,17 = 24.70 inches = 2.06 feet <br />1 <br />Temperatures corrected for 1063-foot elevation gain by subtracting 4.25°F from mean <br />2monthly temperatures recorded at Hayden, Colorado, NOAA (1979, 1960) station. <br />3 ata from Schulz (1976] for 40.5° north latitude. <br />Precipitation corrected for 1063-foot elevation gain by multiplying Hayden NOAA data by <br />1.23. <br />• <br />27 <br />