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Hydrology Future Use Any improvement in vater supply conditions must be accomplished by increasing the irrigation efficiency of existing supplies. This type of development is imperative because there are nO substantial new water supplies available to be developed. The dominant.aspect of future project operations are, therefore, concerned with improving the water use efficiency. All future project diversions should be limited to actual reQuirements for the 19,717 acres of irrigable lands. Releases of water stored in the reservoir should be made only as needed to supplement natural flovs in meeting these requirements. Water rights for the area, including that for the Model Reservoir, should be exercised for the benefit of all irrigable lands. Priority of use, as between these vater rights, should be exercised only when the stored project water supply fails .to meet the requirements. , -,.1 Irrigation season flows in excess of the requirements and most winter flows will become storable under the Model decree in Trinidad Reservoir. In effect, the reservoir would store that portion of the historic diversion in excess of the actual requirements, Project Operation Studies An operation study was prepared using the criteria that all project lands would share the water supply equally. The results indicated that an average of 51,100 acre-feet per year could be diverted as needeci to meet the actual requirements. This q,uanti ty is greater by 13,800 aCre-feet per year than that used efficiently in historic operations to meet requirements. Table 6 is a summarization of the project operation studies. Modified Operation Study At the request of the Purgatoire River Water Conservancy District, a modified operation study was made which recognized and brought out some advantages to the water users holding the 11 ,...., .'