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o ~ 0Cl -..J .... " , ,,' be investigated thoroughly in the study. Possibly an additional amount of storage water may be made available if non-beneficial winter irrigation can be reduced. Once the optimum operational plan is determined the machinery for administration will have to be developed. This will include evaporation curves, return flow relatmons, etc. Another problem is apparent because the compact provides that the decreed water rights below John Martin are not to be considered in the priority system as long as water is available in the conservation pool. A recommendation will be made for change in this policy to allow an irrigator who has used his storage to place a call on the river. Compunations will be made on a monthly basis for compact yearsI950-1970. The compact year is the administrative year which begins on November 1 and ends the following October 31. Compact year 1950 was selected as the starting point because it was the first year of the present administration. It is expected that most of the computations will be performed by the digital computer. an IBM 360-50. owned by the State of Colorado. The following basic data will be required: 1. Diversions for each of nine ditches in Colorado 1 2. Demands for reservoir water by Colorado and Kansasl 3. Outflow from John Martin Reservoirl 4, Inflow to John Martin Reservoirl 5. Contents of John Martin Reservoirl 6. Stream gaging records ~rom the Arkansas River and Purgatoire River at Las Animas, the Arkansas River at Lamar and the Arkansas River at the statelinel 7. Precipitation and evaporation 1 8. Percent sunshine at Pueblo for crop evapotrans- piration computations 1 9. Information concerning the individual ditches in Colorado - types and acreages of cropsl and 10. Diversions for winter storage in the Great Plains Reservoir by the Amity Canal. -3-