Laserfiche WebLink
<br />5) Add the terrain rise rate and the diffusion rate to determine the <br />total rise rate. From this determination, develop the final CNG network to <br />best seed the target area. In borderline cases, be generous rather than con- <br />servative in CNG assignments. <br />Figure 2-3 (The CNG Scheduling/Limit Worksheet) provides the details <br />considered when developing a generator selection decision. <br />The above procedure permitted the selection of a primary line of gen- <br />erators, and a secondary line (upstream) to ensure adequate coverage of the <br />target area. A choice of generators, from,. a cluster of potentially usable <br />generators, was subjectively made by the forecaster. His choice considered <br />location, height, synoptic situation and operational cost as factors in the <br />selection of the generator(s) to be used. <br />The spacing of the generators was guided by a chart illustrated by <br />Figure 2-4. This guide was put together from the output of the WPlume model <br />from the time-share computer system which was used on all experimental days <br />during the 1972-73 and 1973-74 operating seasons. <br /> <br />~ <br /> <br />2.5 <br /> <br />SUSPENSION CRITERIA <br /> <br />Operational seeding was to be suspended during situations which could <br />have had pronounced detrimental effects on the public in and near the proj ect <br />area. Seeding suspensions were generally expected to be due to severe ava- <br />lanche dangers and when the seasonal snowpack was much above the long-term <br />averages as follows: <br />1. Above Normal Snowpack. Seeding will be suspended for those portions <br />of the target area where the snowpack, as determined by measure- <br />ments at existing snow courses, exceeds the following accululation <br />envelope: <br />a. No pack on October I to 200 percent of long-term average <br />February I snow course amounts. <br />b. 200 percent long-term average February I amount to 175 per- <br />cent long-term average March I snow course amounts. <br />c. 175 percent long-term March I amount to 150 percent long-term <br />average April I snow course amounts. <br />d. 150 percent long-term April I amount to 150 percent long-term <br />average May I snow course amounts. <br /> <br />2-11 <br />