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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />diffusion conditions for ground-released seeding and also have <br />unsafe flying conditions for aircraft seeding. <br />Sites would be selected for manually-controlled, ground- <br />based generators with elevations that will be as far above the <br />mean elevation of the valley floor as practical while still <br />providing the desired plume coverage over the seeded area. <br />Wherever satisfactory sites could not be found for manually- <br />controlled generators, remotl3ly-controlled, ground-based generators <br />would be located in the upper regions of the foothills upwind of <br />the seeded area. <br />The placement concept of the ground-based generator network <br />would be such that the sites would be approximately 15 to 20 miles <br />upwind of the first priminen"c ridge in the primary seeding area. <br />The distribution of remote generators with respect to the manual <br />generators would be in a pat"tern that would allow the remote net- <br />work to operate separately under marginal surface wind and low- <br />level stable air conditions 'Nhen most of the manual system would <br />have unsatisfactory atmospheric dispersing conditions for the <br />nuclei released. <br />Figure 6 indicates the proposed locations of the ground-based <br />generators for this program. Twenty-five of the 38 generators in <br />the total network are manually-controlled sites. The remaining 13 <br />generators are remotely-controlled sites. <br />It is proposed that these generators have a variable seed rate <br />capability. At least two and quite possibly three seed rates would <br />be desirable. If two rates are selected, the rates of 5 and 20 <br />grams of silver iodide appear to be the most compatible with the <br />types of cloud systems expec1:ed over this region of Colorado. If <br />three rates are desired, then the rates of 6, 12 and 18 would best <br />fit the expected cloud condi1:ions. In the case of both the two or <br />three rate capabilities, only two set solution flow meters would be <br />required for the remote sites as the third setting is simply a <br />combination of the first two rates. <br />At least three aircraft are proposed for this program for the <br />aircraft seeding efforts. This number of aircraft should provide <br />the necessary plume continui1:y for effective seeding. <br /> <br />-27- <br />