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<br />the Highway Patrol exchanged useful information with the ava- <br />lanche researchers. The Soil Conservation Service provided <br />snow survey data and the Geological Survey provided stream- <br />flow data. The ~ational Oceanic and Atmospheric Administra- <br />tion and the National Center for Atmospheric Research made <br />instrumented aircraft available for special studies in the <br />project area. The Department of Transportation shared the <br />cost of the avalanche research project. <br /> <br />Specific goals of the CRBPP can be considered under the four <br />components of a precipitation management system. <br /> <br />Analysis. - The goal of the analysis function was to deter- <br />mine an appropriate area in which to locate the pilot proj- <br />ect. The hydrology and climatology for the Upper Colorado <br />River Basin were studied to identify areas with persistent <br />wint6r-season snowpack, low population density, high fre- <br />quency of seedable storms, and accessibility for equip- <br />~ent and instrumentation. Some estimates were made, using <br />existing models, of the value of additional flow in the <br />Colorado River and of the anticipated cost of providing <br />that water by cloud seeding. A portion of the San Juan <br />~buntains of southwestern Colorado was identified, and <br />public meetings with State and local groups were held to <br />determine project acceptability. As a result of these <br />meetings, the proposed project area was significantly <br />reduced to avoid population centers (fig. 1-12). The <br />results of earlier ecology studies were used in deter- <br />mining that the proposed project would not result in <br />any catastrophic effects on the environment. These <br />studies also became the foundation of an ecological <br />field program in the project area. <br /> <br />Recognition. - The goal of the recognition function was <br />to detect those winter storms that could be seeded suc- <br />cessfully and whose precipitation would be centered on the <br />study area. A previously developed conceptual model of <br />wintertime orographic clouds was modified for use in the <br />San Juans. No satisfactory nUIJerical computer model was <br />available for real-time decisionrnaking. <br /> <br />Treatment. - The goal of the treatment function was to <br />carry out the treatment of suitable storms in a safe and <br />effective manner. Procedures were developed to identify <br />which ground-based silver iodide generators should be acti- <br />vated to confine the effects of seeding to the study area. <br /> <br />1-27 <br />