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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />.' <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />It is also recognized that on certain occasions weather events, not previously <br />forecast to have a significant impact on people or property, develop into potentially <br />serious situations. NA WC's policy in these cases will be to monitor all available weather <br />data during storm periods and to suspend operations, whenever in NA WC's judgement, <br />there is a potential for such an event occurring. The sponsors of this project or authorized <br />representatives of the Colorado Department of Natural resources may also request that <br />seeding not be conducted under any special circumstances. <br /> <br />2.7 Summary <br /> <br />A winter cloud seeding project to affect the mountainous areas above 9,000" MSL <br />of Gunnison County during the months of November through April is considered to be <br />feasible. The project would utilize approximately 18 ground based, manually operated <br />silver iodide generators to seed selected periods of naturally occurring storms that occur <br />during these months. The estimated results from the performance of such a project is a <br />10-20% increase in precipitation in these mountainous areas. This estimate is based upon <br />the results achieved in other NA WC operated winter orographic cloud seeding programs <br />(i.e. Griffith, et aI, 1991) with similar designs to the one proposed for this project and a <br />policy statement issued by the American Meteorological Society (AMS, 1999). The <br />resulting augmented spring, summer and fall streamflow will then be available for a <br />variety of uses. It is estimated that this augmented streamflow will be produced at the <br />rate of a few dollars per acre foot based upon assessments conducted on other similar <br />winter orographic cloud seeding projects. A study in Utah (Stauffer, 2001) indicated <br />additional streamflow from aNA WC operated project in a number of mountainous areas <br />of the state was producing additional runoff for an average estimated $1.02 per acre foot. <br />A NA we study (Griffith and Solak, 2002) of a project being conducted in Idaho by <br />NAWC indicated the additional runoff was being produced at an average estimated rate <br />of$0.37 per acre foot. <br /> <br />29 <br />