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Sierra Pacific Power Company, a utility company in the RenoSparks, Nevada area and the Pyramid Lake Paiute Indian Tribe have negotiated an agreement, referred to as the Preliminary Settlement Agreement. The agreement provides for storage of water for use in the Reno-Sparks area during drought periods and for augmentation and modification of flows in the lower Truckee River at a time to improve spawning conditions for an endangered species of fish, the cui-ui. Two uncalibrated models of the system are available, the Bureau of Reclamation (BOR) model and the Negotiation model. Both are monthly mass-balance accounting type models. The Negotiation model was used to study the effects of the Preliminary Settlement Agreement and various amounts of depletions from the upper Truckee River on selected parts of the system. Model simulations were made for the 80-year period, 1901-1980. Because the models are uncalibrated and lack documentation, conclusions drawn from model simulations contain an unknown degree of uncertainty. Model simulations using the provisions of the Preliminary Settlement Agreement indicate small increases in water shortages in the Newlands Project. Increased water use in the Reno-Sparks area may reduce future downstream supplies whether or not the Preliminary Settlement Agreement is in place, making the effect of the Preliminary Settlement Agreement of probably negligible consequence to the Newlands Project. Model analyses project a higher cui-ui index (an index related to the number of adult female cui-ui) with the Preliminary Settlement Agreement in place than without it, except when large depletions are made in the upper Truckee River. When there are large depletions, the modeled cui-ui index is about the same with or without the provisions of the Preliminary Settlement Agreement. Large depletions reduce the cui-ui index by 20 to 60 percent when compared with historical depletions. (1) U.S. Geological Survey, Reston, Virginia (2) U.S. Bureau of Reclamation, Carson City, Nevada (3) U.S. Geological Survey, Carson City, Nevada A program is ongoing to purchase water rights in the Newlands Project area for application of water to benefit fish and wildlife in the Lahontan Valley wetlands. Only a part of the purchased water would be applied to the wetlands, a part is not diverted out of the Truckee River and therefore flows to Pyramid Lake. According to model simulations, the purchase of 30,000 to 40,000 acre-feet of water rights for application to Lahontan Valley wetlands also results in increases to the cui-ui index by 7,000 to 29,000 and increases the levels of Pyramid Lake.

Review of selected water-management models and results of simulations for the Truckee-Carson Rivers system, California and Nevada