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<br />SECTION IV <br /> <br />CHANGES IN OPERATING PROCEDURES <br /> <br />A. Cloud-top Seeding <br /> <br />Several major changes in operating procedures were brought <br />about by the introduction of the two cloud-top seeding aircraft, both <br />of which were based at the Lakin Airport operations site. <br /> <br />1. The major feature of the cloud-top seeding method was <br />that the ice nuclei generating flares could be very selectively and <br />. --------.- . <br /> <br />rapidly dispersed into the new cloud growth of threatening storms. <br /> <br />2. The fully instrumented turbo-charged aircraft were able <br />to safely operate at night by seeding at cloud-top. <br /> <br />3. Point release of seeding material by use of droppable <br />flares enabled aircrews and the seeding director to more clearly <br />identify the release location and thereby identify which cloud com- <br />plexes were recipients of silver iodide nuclei and which were not. <br /> <br />B. Cloud-Base Seeding <br /> <br />Although cloud top seeding was the main teclmique used in <br />Muddy Road IV, provisions were also made to seed from cloud base. <br />Both the Navajos had a back-up cloud-base seeding device. The <br />T-34 based at Johnson City was used exclusively for cloud-base <br />seeding. <br /> <br />C. T-33 Utilization <br /> <br />The T-33 single engine jet aircraft was allocated to the <br />Muddy Road IV project by the Kansas Water Resources Board from <br /> <br />8 <br />