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~~ ~ .. . ' e e . COLORADO WATER CONSERVATION BOARD Department of Natural Resources 721 State Centennial Building '313 Sherman Street Denver, Colorado 80203 Phone: (303) 8&6-]441 STATE OF COLOMDO ~ MEMORANDUM Roy Romer Governor David w. Walker Director TO: Members, CWCB FROM: Dan Merriman DATE: November 1, 1991 SUBJECT: Agenda Item 19b, November 14-15, 1991, Board Meeting-- Instream Flow Program: Staff Actions Case No. 5-90CW139; W /J Ranch Application Summary The applicant requests underground water rights, water storage rights, and approval of a plan for augmentation on the Roaring Fork River near the town of Aspen in Pitkin County (see attached map). Applicant is proposing to augment out-of-priority depletions by five domestic wells serving a 150 unit housing development with augmentation water purchased from Ruedi Reservoir, releases of water from an on-site pond, or by dedicating upstream senior consumptive use credits to the stream. CWCB Appropriation The Board holds an instream flow water right on the Roaring Fork River for 55 cfs, summer, and 30 cfs, winter, with an appropriation date of November 8, 1985, which could be injured by this application. . Potential for Injurv The proposed use of Ruedi Reservoir as an augmentation source will not replace out- of-priority well depletions at the point they occur on the stream. The maximum injury which could be expected to occur as a result of this application has been calculated at 0.030 cfs. This represents approximately 0.054 percent of the Board's summer instream flow on the Roaring Fork River. To date, there have been nine other de minimis impacts to this reach of Roaring Fork River. The cumulative impact on this reach of the Roaring Fork River, including this application, equals 0.880 percent of the Board's instream flow right. The staff has not filed a statement of opposition in this case in accordance with Board procedures regarding de minimis injuries.