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O:lUSG The firm of W. W. Wheeler, and Associates analyzed historic ditch diversions by the various ditches from Pueblo to the state line on a frequency basis, the ditch diversions versus the supply as re- flected by the flows at the Canon City gage to determine the impact of man-made changes influencing water utilization in this reach in recent years, comparisons of the flow at Canon City versus outflow from the state at the state line, water quality variations from Pueblo to the state line, and other phases of water supply. In the 1967 studies considerable time was devoted to the development of programs for computer solution which incorporated the many variables affecting the use and reuse of the water resources in the basin. These programs are included herein as Figures I and 2. The reasons for making such computer studies, and the studies believed to be necessary, were discussed in the December, 1967, report from which the following is quoted: A number of computer studies should be made if the best water management plan or plans are to be developed for the Arkansas River Basin in Colorado. Because of the junior priorities of irrigation wells and their adverse effect upon the senior surface water rights, it is recommended that the first study be a reconstruction of the stream flow on a monthly basis with John Hartin Reservoir in operation, and the determination of the water supply available to the various appropriators according to their vested water rights. Variations of this study would include the operation of John Hartin Reservoir in accordance with the past practices under the Colorado-Kansas compact, modification of these practices concerning deliveries in Colorado, and eliminating Colorado's obligations to deliver water to Kansas on the assumption that storage would be provided in Kansas to compensate Kansas for the water now obtained by that state from John Hartin Reservoir. Also another variation would be studies assuming full operation of the Frying Pan Arkansas Project. The recommended final computer studies would include the integration of wells and ground water use therefrom in conjunction with the use of surface waters to obtain the greatest benefit from the state's water resources in this basin. In these studies it would be assumed that winter irri- gation will and will not be used and that the Frying Pan Arkansas Project will and will not be in opera- tion. The studies would require various adjustments to protect vested senior water rights. In these - 3 -