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<br />The decrease from the 9.5 percent increment (Table 2.8) is <br />due to the inability of ground-based seeding units to effectively <br />seed when stable flow occurs. If an aircraft or mountaintop <br />seeders were used with the ground-based seeders, the revised <br />increment would be ll.l percent. Although the lower Salt <br />River drainage was not discussed in Section 2.4, the modeling <br />results suggest that the expected increments there would resemble <br />those for the Verde River drainage. <br /> <br />The expected seeding increments could be reduced somewhat <br />due to either seeding suspensions during inclement weather <br />or to excessive seasonal precipitation. Suspension criteria <br />should be developed prior to the establishment of an operational <br />program to identify situations when seeding should be suspended. <br />Certain situations involving public safety requires suspension <br />criteria to minimize either actual contribution to or apparent <br />contribution to a potentially hazardous situation even though <br />actual seeding increases might be nominal. The two main functions <br />of suspension, in addition to safeguarding public interest, <br />would be: I) to limit liability associated with weather modifi- <br />cation and 2) to maintain a desirable public image for the <br />project. <br /> <br />3.3 Seeding Program Design <br /> <br />The modeling results suggest a two-tiered seeding program <br />design. One part would consist of a network of ground-based <br />seeding devices within and upwind of the Salt and Verde River <br />drainages. Except for those affecting the Baldy Peak region, <br />the ground-based seeders should only be used during the more <br />convective storms. The second part of the design would involve <br />remotely-controlled mountaintop seeders or one or more seeding <br />aircraft to seed the stable storms. Previous experience in <br /> <br />3-27 <br /> <br />- <br />