In 2004, Reclamation's Lower Colorado Region initiated a research and development program, collaborating with other federal agencies and universities, for the purpose of enabling the use of new methods for projecting possible future river flows that take into account increased hydrologic variability and potential decreases in the river's annual inflow due to a changing climate. As part of this effort and in conjunction with the development of the Interim Guidelines, additional analyses were included in the Environmental Impact Statement that considered the impacts of greater hydrologic variability than have been seen in the 100-year record.
The Interim Guidelines are in place through 2026 and include a provision that Beginning no later than December 31, 2020, the Secretary [of Interior] shall initiate a formal review for purposes of evaluating the effectiveness of these Guidelines. Further knowledge of the impacts of a changing climate, both realized and projected, will be critical when such a review is initiated. Accordingly, the Colorado River Basin Water Supply and Demand Study (Study) under Reclamation's Basin Study Program was initiated in the beginning of 2010. The purpose of the Study is to conduct a comprehensive study to define current and future imbalances in water supply and demand in the Colorado River Basin over the next 50 years to develop and analyze adaptation and mitigation strategies to resolve those imbalances. This Study and other research efforts through continuation of the research and development program will further Reclamation's ability to analyze the potential impacts of climate change and use that information in water and power operations and planning studies to be able to adapt, as appropriate, the operation and management of the river to a changing future climate.