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Monthty Average Temperatures and Precipitation (For weather station located at <br />40'27'N, 107.36'E, approximately 20 miles west of site, during the 10-year period <br />1970-1980): <br />Snowpack is assumed to result from all precipitation occurring during months <br />where average ambient temperature is less than 0°C (November -March) <br />Average Annual Snowpack = 0.84 + 1.09 + 1.26 + 1.06 + 1.48 <br />= 5.73 inches of precipitation <br /> <br />snowmelt will occur when average monthly temperatures are above O°C (Average <br />monthly temperature corresponds to degree day index) <br />April: Md = 0.27 (5.2°C) <br />= 1.42 cm/day - <br />Mm = 1.42 cm/day x 30 days x (1 in/2.54 cm) <br />= 16.83 inches <br />Since average annual snowpack is equivalent to only 5.73 inches of precipitation <br />and the April snowmelt potential is 16.83 inches, the snowpack will normally meR <br />completely during April. <br />Recognizing that some loss off snowpack moisture will occur due to sublimation, <br />evaporation and limited snowmelt during warm winter days, it is conservatively <br />assumed that 60 percent of the total snowpack moisture will be available during <br /> <br />11 <br />