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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 />II <br /> <br />tant cloud volume. Dry ice pellets are dispensed from aircraft and fall <br />some small distance and so require more of a dispersal effort than the <br />droppable pyrotechnics, which can be designed to drop specified dis- <br />tances and even contain a delayed ignition of the treatment-agent <br />bearing mixture. <br /> <br />Ground-based generators (figure 15 in chapter 5) produce a silver iodide <br />complex and disperse the agent into the immediate, surrounding air <br />volume which is then carried up into the orographic or convective clouds <br />by turbulent action. The generators must be properly located or the <br />seeding agent may become trapped in a stable or blocked layer and not <br />reach the cloud volume desired in a timely manner. Additionally, the <br />agent may not disperse to required higher a,nd colder portions of a <br />cloud. Advantages of this method include low cost of equipment purchase <br />and operation, and since generators can be remotely operated via a com- <br />munications system, their use is timely. <br /> <br />The selection of a treatment method will dE!pend on terrain features and <br />meteorological conditions in the area of interest. Some situations may <br />require the availability of both ground and airborne nuclei generating <br />systems. <br /> <br />17 <br />