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Last modified
7/28/2009 2:28:45 PM
Creation date
10/1/2006 2:16:56 PM
Metadata
Fields
Template:
Weather Modification
Applicant
Valley Grovers
Project Name
San Luis Valley
Date
1/1/1975
Weather Modification - Doc Type
Record of Decision
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<br />11. Seeding of storms will be performed through the use of approximately <br />13 to 15 manually operated ground based cloud nuclei generators, of the same <br />type as used on the Colorado River Basin Pilot Project, located within and <br />to the south and east of the Project Area. In previous use these generators <br />have proven to be efficient and safe nuclei generators. The seeding solution <br />will be 4 percent silver iodide 'and 1.25 percent sodium iodide in acetone. <br />This solution when burned in a propane flame at a rate of 20 grams per hour <br />per site will produce approximately 1016 effective nuclei in cloud systems <br />with a 500 mb temperature around _20' C. At a bu1g rate of 140 grams per <br />hour, this solution will produce approximately 10 effective nuclei in <br />cloud systems with a 500 mb temperature around _15' C or slightly warmer. <br /> <br />12, A program of random decisions will be established with 4 seed <br />decisions for every 1 no seed decision. Prior to each storm event with favor- <br />able seeding wind conditions, a random decision for that event will be deter- <br />mined. By incorporating this randomization operation into the Project, <br />additional scientific and technological information should be learned from the <br />Project and will be used to further refine operations in the future, will be <br />available to public arid scientific groups, and hopefully will lead to advance- <br />ments in technology, ' <br />.. <br />13. An' analysis of low level wind fields, cloud characteristics, ~ability <br />parameters, terrain features, and synoptic meteorological features will be made <br />to determine the network of generators which will best seed the cloud systems <br />over the project area for each situation and will provide a method for adjusting <br />the network as new weather information becomes available. <br /> <br />14. Hith a "best" initial network to seed a situation established, the <br />generator operators will be instructed to turn on their generators at a specified <br />time and to run them at a specific burn rate. Incoming weather data into the <br />Applicant's forecast office at Durango, Colorado, will allow continuous <br />monitoring of changes in conditions and provide bases for making adjustments <br />to or termination of seeding operations. <br /> <br />15, The anticipated increase in precipitation in the Project Area is <br />between 3 and 5 percent above. natural precipitation. This may be compared <br />to the expected precipitation increase ,of the Colorado River Bas~n Pilot <br />Proj ect of 15 to 20 percent. ... . <br /> <br />16. To help assure the people that will be affected in and around the <br />Project Area that there sha1l be adequate safeguards against any subsfantial <br />damage, ,the Licensed Operator met with the group consisting of the Concerned <br />Citizens for the Preservation of the Natural Resources, which is comprised of <br />farmers, cattlemen, and others; Valley ,Growers, Inc., an ,organization of . <br />approximately 300 farmers in the San. luis Valley with both pumps and surface' <br />flow water rights; and the Rio Grande Cons'ervancy District, and proposed the', <br />following additional seeding considerations, some of which would lead,to <br />suspension of seeding operations under very unique weather or snowpack conditions: <br /> <br />(1) <br /> <br />Propose the suspending of seeding operations for <br />periods when the average snowpack within the project <br />area reaches 125% of Normal snowpack. The average <br />snowpack will be calculated by averaging the actual <br />S,C,S. snowpack readings for water content from three <br />selected S.C,S. snow course sites within the project <br />area; one from within each of the three seeded <br />drainage basins (Conejos, Alamosa, and Rio Grande),., <br />The Normal snowpack will be the average water content <br />of the snowpack for the past fifteen (15) years of <br />'Tecord .for each ,.of :the three sel ected S. C.S. snow <br />courses. <br /> <br />(2) <br /> <br />.Seedingoperationswillbe suspended during storm <br />periods forecast to produce unusually heavy pre- <br />d pi ta'ti1Jn .amaunt,..which"could. poss'ib ly. contribute <br />"to the occurrences of avalanches or" severe -weather <br />conditions within the project area. <br /> <br />-.3.. <br />
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