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~~ <br />spring snowmelt as surface moisture. This moisture will either infiltrate into the soil <br />or contribute to runoff. <br />c <br />5.73 inches x 0.60 = 3.44 inches <br />Development of snowmelt runoff hydrographs is very complex, involving <br />determination of antecedent moisture conditions, soil temperatures, air <br />temperatures, wind velocities, and solar radiation levels as well as watershed <br />characteristics. In order to provide a rough estimate of snowmelt runoff without <br />resorting to complex calculations, the SEDCAD + program was utilized to model <br />each watershed with the following simplifying assumptions: _ ' <br />• snowmelt contribution to runoff =Precipitation = 3.44 inches <br />• Precipitation distribution represented by SCS Type la (low intensity <br />storm with gradual infiltration) <br /> <br />• Storm duration is 100-year, 24-hour event (large volume storm) <br />• Hydrograph response of slow selected (Gradual melting and runoff) <br />• All other watershed characteristics are the same <br />~, S <br />;, ~~ <br /> <br />12 <br />