Laserfiche WebLink
<br />the lower Salt and Verde River drainages would occur as rain, <br />not snow. <br /> <br />3.2.6 I~lications of the Modeling Results on Expected <br />Seeding Increments. In Section 2.4, seeding increments were <br />calculated for two raingage stations, Flagstaff (Verde River) <br />and Whiteriver (Salt River). The calculations assumed seeding <br />in the most efficient mode possible. In addition, seeding <br />increments were not applied to precipitation occurring with <br />downslope (negative Vn) flow. These modeling studies have <br />indicated that a manually-operated, ground-based seeding program <br />would have little effect under stable flow except in the upper <br />Salt River drainage. Aircraft or remotely-controlled mountaintop <br />seeders would be required. The studies also showed that the <br />Salt River drainage could be effectively seeded when northwesterly <br />(negative Vn) winds occurred. Since less than two percent <br />of the seasonal precipitation in the _Verde River drainage <br />occurs with downslope flow, modeling was not done for those <br />conditions. <br /> <br />As a result of these modeling considerations, the calculated <br />seeding increments shown in Table 2.8 have been altered. <br />The revised increments are given in T~ble 3.5. The upper <br />Salt River drainage benefits the most from the changes, since <br />increases could be expected under stable flow and also under <br />any type of flow associated with a negative wind component. <br />These increases could be achieved with a manually-controlled, <br />ground-based seeding network. The revised increment in Table <br />3.5 is 25.6 percent, in comparison to the previous increment <br />of 17.2 percent. <br /> <br />For the Verde River drainage, the revised increment for <br />a manually-operated, ground-based seeding program is 3.4 percent. <br /> <br />3-25 <br /> <br />. <br />