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PART IV HYDROLOGY Estimates of future water requirements and supplies were derived from weather, stream flow, and diversion records for the 33-year study period 1925-195T. The stream flows and diversions derived from the historical data were used in preparing studies which show an accounting of past water supply conditions in the project area and future operations with the project. The water rights on the Purgatoire River and the Arkansas River Compact were recognized fully in the studies, WATER RIGHTS ') As shown on exhibit 4, water rights for the 11 participating ditch systems in the project area have priority dates ranging from November 30, 1861, to June 12, 1920. The direct flow rights range from 0,50 c.f;s. to 200 c.f,s. Stream flows are such that for most of the irrigation season only the most senior direct flow rights receive water. The 20,000 acre-foot storage right owned by the Model Land and Irrigation Company cannot now be fully e~ercised because of sediment accumulation in its existing reservoir. The small storage right for Johns Lake Reservoir has not been exercised for many years, The direct flow rights listed on exhibit 4 are for the 11 ditch systems that will participate in the project. There are other Purgatoire River water rights, both upstream and downstream from the project area. Depletions for the upstream rights are reflected in historic stream flow records and no additional depletions are foreseeable. Required bypasses for the downstream rights were evaluated in the operation studies. Historically, such bypasses have seldom been required. INTERSTATE COMPACTS AND COURT DECREES The existing decreed water rights of the project area are not subject to restrictions from any existing or pending interstate compacts or court decrees, Any new water rights will be restricted by the Arkansas River Compact. 11 .,