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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 />On March 27, 1987, a proposal was submitted by USSR to TVA outlining a three- <br />phase program of study to assess the precipitation augmentation poten~ial for <br />the three spring months in the eastern TVA region. The three phases are (1) <br />meteorological studies to determine the feasibility of cloud seeding, (2) <br />exploratory field experiments to determine cloud properties for developing <br />seeding hypotheses, and (3) a demonstration program to evaluate an operational <br />seeding program. On August 18, 1987, an agreement was signed between the TVA <br />and the DARR, USSR, whereby DARR would implement the first phase of the three- <br />phase program. <br /> <br />1.2 Phase I Approach <br /> <br />As stated above this first phase is designed to examine existing data sources in <br />order to better understand the weather events affecting the region and thus <br />identify the potential for seeding opportunities. <br /> <br />Specific objectives of this study and activities directed toward their ful- <br />fillment are as follows: <br /> <br />1. Identify precipitation events during the months of March, April and May <br />for the period of record within the study area. This study examines precipita- <br />tion records in order to gain perspective on the representativeness of recent <br />dry winters. <br /> <br />2. Determine the organization and structure of clouds and precipitation systems <br />affecting the eastern TVA region. This study examines available data sets in <br />order to determine if a precipitation augmentation potential exists over the <br />study area. The results of this study infer the potential for various possible <br />seeding methods within candidate cloud systems. The results have important <br />implications as to how an operational program should be conducted. <br /> <br />3. Determine the hydrological benefits and the costs of an operational cloud <br />seeding program within the project area. Projected increase~ in streamflow for <br />this study were based on data collected in the eastern TVA region combined with <br />previously reported cloud seeding results elsewhere. The results compare the <br />amount of water delivered by precipitation enhancement and the benefits of this <br />water to the cost of its production. <br /> <br />The results of these three individual studies form a scientific and economic <br />foundation on which to evaluate the implementation of the second phase of this <br />three-phase study. <br /> <br />4. Specify the design of Phase II. This part of the study outlines the objec- <br />tives and cost of a one-time, intensive 3-month field program to obtain detailed _ <br />physical measurements of the clouds in the eastern TVA region. The purpose of <br />Phase II would be to confirm with in situ observations the seeding potential in <br />candidate clouds specified in Phase-I:-and to develop seeding hypotheses for a <br />Phase III demonstration program. <br /> <br />- <br /> <br />2 <br />