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Last modified
7/28/2009 2:28:35 PM
Creation date
10/1/2006 2:15:59 PM
Metadata
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Template:
Weather Modification
Contract/Permit #
#98-4
Applicant
North American Weather
Project Name
Willow Creek Basin
Date
11/1/1998
Weather Modification - Doc Type
Application
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<br />Questions <br />4, 5, and 11: <br /> <br />Question 6: <br /> <br />C:\23447\pennit..tt <br /> <br />Certain storm characteristics wi)! be monitored to determine whether a <br />storm, or a portion of a storm, is to be seeded. Criteria that will be . <br />considered will include cloud top temperature, lower-level atmospheric <br />stability, height of cloud base, and airmass temperature. General <br />seeding guidelines will call for seeding if the cloud top temperatures are <br />expected to be from -10aC to _30aC, there are no low-level stable <br />atmospheric layers which would restrict the vertical dispersion of the <br />seeding material, cloud base heights that are below the crest of the <br />mountains which comprise the intended target area, and lower-level <br />temperatures which are cold enough to promote silver iodide nucleation <br />(_sac or colder) to which the silver iodide material can reasonably be <br />expected to travel. <br /> <br />. The intended target area serves as an important winter snowpack <br />accumulation area. As the snowpack melts during the spring and <br />summer months, it provides surface runoff and underground water <br />recharge. This water is utilized by a number of different water users <br />through streamflow diversions, storage in reservoirs and subsequent <br />dispensing to water users, and recharging of groundwater. The <br />objective of the proposed operation is to increase the availability of <br />these natural water supplies originating in the target area. The <br />anticipated level of enhancement of the naturally occurring <br />precipitation in the target area during the period of operation is on the <br />order of 10 to 15 percent increase in precipitation. The enhancement in <br />surface streamflow is expected to be in the same range as the increase <br />in precipitation. <br /> <br />Increases in precipitation in the target area would provide additional <br />water supplies to the resident flora. Supplemental streamflow should <br />provide an enhanced environment for the resident fISh populations. <br /> <br />The program should improve recre.'ltional opportunities in the target <br />area, increase agricultural production, and provide additional water <br />supplies to municipalities. <br /> <br />. . , <br />Research at Colorado State University has indicated that minute <br />particles of silver iodide have the ability to convert cloud water <br />droplets below approximately _sac (supercooled) into ice crystals <br />(Garvey, 1974). Other research in numerous mountainous locations in <br />wintertime has indi~~ed th:lt supercooled water droplets occur in <br />storms that affect such areas (Super and Boe, 1988) (Solak, et a!., <br />1988). Specifically, research conducted over the Grand Mesa in <br />western Colorado (Thompson and Super, 1987) has indicated that <br />periods with supercooled clouds occur during winter storms. Ludlum <br /> <br />2 <br />
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