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;j PARSHALL PROJECT. COLORADO Usable return flow Return flows from project water delivered to lands under the Skylark and Parshall Flats Canals and to lands above the Skylark Canal by exchange would be reusable on lower lands in the project area. It is estimated that 30 percent of the water diverted into the two canals would be reusable during the irrigation season. Of the amount reusable it is estimated that 40 percent would become available in the month of initial application, and 30. 20, and 10 percent in each of the next 3 months, respectively. Project water rights A conditional right for the storage of 73,248 acre-feet of ~lilliams Fork River water annually in the Ute Park Reservoir has been decreed to the Middle Park Water Conservancy District. This right with a priority date of September 8, 1954. would be available to the project. The Big Lake Ditch Company has expressed a willingness to assign to the project its conditional decreed right to divert 159 second-feet of water from the Williams Fork River for irrigation. This conditional right has a priority date of September 1. 1904; Claim should be made for an addi- tional natural flow right for water to be diverted into the Skylark Canal if project development under Plan I is found .to be justified. In the project operation studies it was assumed that project rights for the Ute Park Reservoir under either of the plans would be senior to the power right of the city and county of Denver for the ~li1liams Fork Powerplant. Under Plan I project rights were assumed to have priority over Denver's rights for its Blue River diversion plan. In Plan II the Denver Blue River diversion plan was assumed to have priority of rights over the project. Project water operation studies Simulated project operation studies were made for both project plans based on available water supplies, water rights, and irrigation require- ments per acre previously explaine,d. In estimating present irrigation supplies on project lands it was considered that the absolute rights of the Big Lake ditch for 205 second-feet, including the30-second-foot right of Coberly Brothers, are fully valid. An average of 210 acre-feet of water annUally was assumed to be presently utilized under the 159- second-foot conditional right of the Big Lake ditch, leaving the remain- ing water under the right available for project development. Neither operation study included provision for the release of water at Ute Park Reservoir solely for the benefit of the river fiShery. Annual operation summaries for each of the two plans are tabulated on the following page. Additional data. on the effects of the plans are tabulated on page 20. 18