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<br />'003493 <br /> <br />meet the seedability criteria tend to have 500 mb temperatures and 700 mb <br />wind directions that, according to the Rhea model, favor snowfall in the <br />southern basins. <br /> <br />Percentage increases do not appear related to the wetness or dryness <br />of the winter in any of the 12 basins. If such a relationship exists, it <br />would produce a general upward slope in the charted bars for each basin <br />since winters are ranked from driest to wettest. That percentage <br />increases do not vary with the wetness or dryness of the winter is <br />consistent with the conclusion of the preceding section--differences in <br />the number of seedable storms during dry, normal and wet winters are not <br />statistically significant. <br /> <br />With only a few minor exceptions, percentage distributions for the <br />basins within each SUb-region are remarkably similar in shape. This <br />indicates potential for similar percentage increases within sub-regions <br />during any particular winter. <br /> <br />Potential Amounts of Augmented Water <br /> <br />It is difficult to translate the percentage increases in Figures 8-11 <br />into amounts of potentially usable water. However, we can estimate the <br />amounts of augmented water expected each winter from snowfall at <br />individual snowcourse sites by multiplying the observed maximum spring <br />water content by the corresponding percentage increase in Figures 8-11. <br />These estimates do not allow comparisons among basins because they are <br />specific to the particular snowcourses chosen for study. Some courses <br />receive much more snow than others depending on elevation and orientation <br />of nearby mountain barriers to the prevailing wind. This is true for <br />courses within the same basin as well as for courses in different basins. <br />For example, based on long-term averages, the course at Rabbit Ears Pass <br />receives more than twice as much snow as the one at Lynx Pass. However, <br />both are used in this study to represent snowfall in the drainage basin <br />for the Yampa River. <br /> <br />34 <br />