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"'l L-: ". removed, and data from experimental days were reduced to six-hour time blocks to improve the cOl::,relation betTNeen meteorological covariates and precipitation, increases during certain classes of seeded cases were statistically significant. The analysis has enabled identification of seedable situations with much more certainty than before. The overall potential for seeding-produced increases in precipitation during a winter of average snowfall was determined to be about 10 percent" (2). Full seeding potential was not realized in the CRBPP because of the randomized seeding, the inability to make accurate forecasts, contamina- tion, and because many unsuitable clouds were seeded. The project pro- vided additional information for improving future designs. This was confirmed by a congressional directive in 1978 to "prepare plans for the Colorado River Augmentation Demonstration Program." PLANNING FOR A NEW COLORADO RIVER BASIN PROJECT - Is a weather modification program wanted? ,i ! i I . 1 j 1 I I I' With the new direction from Congress after completion of the CRBFP, the Office of Atmospheric Resources Management held a series of meetings with interested Basin government and public representatives. Specific questions were addressed at the meetings. - How soon would additional water be required and where? What would be acceptable as proof of increased water? What concerns would a project raise? I ! I ,I ,I I I I - Are funds available for project cost sharing? The information learned from these meetings is being used to develop q proposal for initiating a new Colorado River Basin Project. Before a decision can be made to proceed with a specific plan. all interested and concerned individuals and agencies must have an opportun- ity to provide comments and suggestions. This input will be obtained by conducting a series of scoping meetings. The meetings will be advertised and open to the public. Although specific plans are not available to present at scoping meetings, it is appropriate to discuss alternatives considered and pre- ferred courses of action. From what is kno~~ about the climatology and the hydrology of the Basin, the following preferences can be stated:. 4 Foehner I ! ! ! \ II I I ;, II I - The greatest potential for increasing winter precipitation is found in areas generally lying above 9,000 feet in elevation. An existing data base is available for the San Juan Mountains where the CRBPP was conducted.