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great deal of progress on my research. I began by familiarizing myself with the RiverWare pro- gram and the Colorado River Simulation System (CRSS) model developed by the USBR within it. This, of course, is still an ongoing process. Once I was fairly familiar with the model, I began to address data formatting and input issues by creating conversion templates and obtaining code that would facilitate importing many slots of data at one time. This is especially critical for chang- ing the streamflow inputs in the model. Finally, I ran the model by simulating the currently ac- cepted streamflow data according to the index - sequential method, a non - parametric technique often used for such purposes. At present, I am analyzing the data output in order to determine how to best compare the response of the river system to the different streamflow simulations. After performing much of the background re- search and preparatory work, I look forward to comparing final results in the near future. It will be interesting to see the difference between the two streamflow simulation methods as well as the difference between using 500 years of stream - flow data as opposed to 100 years. I hope to obtain finalized streamflow data sets shortly so that I may present some of the final results at the November meeting. For now, I am continuing to learn about the particulars of RiverWare, the CRSS model as I analyze the preliminary output, and SAMS, a software for simulating streamflow sequences based on stochastic techniques. Colorado's Evolving Irrigated Agriculture: Economic Accounting and Impact Analysis Jennifer Thorvaldson, Agriculture and Resource Economics M.S. Candidate Colorado State University n order to analyze the economic impacts of reducing irrigated agriculture in Colorado, my first objective is to develop a model rep- resenting the economy and economic interactions within four water basins in Colorado: Arkansas, Republican, Rio Grande, and South Platte. Work- ing to construct background in the topics important to the discussion, I have spent time on the following tasks: • Reading the Colorado Water Conservation Board's Statewide Water Supply Initiative report to understand the methods used and assumptions made when predicting the number of acres that will be lost to irrigation by the year 2030. Installing and understanding the use of soft- ware for the the IMPLAN Input - Output model and 2002 data in preparation for using the model to perform impact analysis. IMPLAN employs two phases of input- output analysis: descriptive and predictive modeling. The descriptive model includes information about local econom- ic interactions known as regional economic accounts, which de- scribe a local economy in terms of the flow of dollars from pur- chasers to producers within the region. The regional economic accounts are used to construct local -level multipliers. Multipli- ers describe the response of the economy to an impact (a change in demand or production). The multipliers represent the predic- tive model. So far, I have built descriptive models for each of the four river basins in my study. The next step is to build the predictive models to estimate the economic impact of the reduction in irrigated acres. At the Water Study Meeting in Fort Morgan, Colo- rado, I was motivated to see that real people will use my research for real issues. Convened by the Morgan County Economic Development Corpo- ration, the meeting was attended by representa-