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0, 02' ';ifJ i...,.. ~ ~ J" ,,- SAN JUAN RIVER BASIN RECOVERY IMPLEMENTATION PROGRAM HYRDOLOGY COMMITTEE POLICY STATEMENT CONCERNING MODEL SOFTWARE Draft, November I, 2000 Version The Hydrology Committee was established as a committee of the San Juan River Basin Recovery Implementation Program (SJRBRIP) on June 14, 2000. One of the purposes of the Committee is: "Review and comment on the SJRIP Hydrology Model, including providing recommendations for model improvements and input data updates. Review and suggest changes or revisions to the model documentation maintained by USBR to ensure that all assumptions and model operating procedures are fully documented and up to date." The Hydrology Committee intends to use the most reasonable modeling tools available. The focus of the modeling effort shall be directed toward the development of a tool that most accurately describes the hydrologic conditions of the basin both in real time and in a predictive manner. The model must also be operable to meet schedules associated with goals of the SJRBRIP. The model used by the SJRBRIP Biology Committee to evaluate hydrology issues for the Flow Recommendations Report, is based on the Riverware generic modeling tool developed by CADSWES of Boulder, Colorado. The Bureau of Reclamation and the Navajo Indian Irrigation Project Office of the Bureau of Indian Affairs have expended considerable time and effort to develop the San Juan River basin model using Riverware. At the time of the formation of the Hydrology Committee there was no other model available for the San Juan Basin hydrology and processing of daily flow and statistics for the comparison to the Flow Recommendations. Therefore, the Hydrology Committee plans to utilize the Riverware software for modeling of the San Juan River basin because it is currently the only and best tool available. However, should new information or modeling tools become available that would enhance, confirm or replace Riverware, the Hydrology Committee will consider adopting the new tools. Model Disclaimer While every effort will be made to incorporate the best data and modeling available into the SJRIP modeling effort, use of the hydrologic model in the work of the Hydrology Committee and the SJRIP does not necessarily constitute agreement or approval by individual Program participants with the Model data, methodologies or assumptions. The model date, methodologies and assumptions do not under any circumstances constitute evidence of actual water use, water rights or water availability under compact apportionment's and should not be construed as binding on any party. Furthermore, use of the model, model data, methodologies and assumptions does not change the responsibilities of the respective states to maintain records of water rights and water use. Official records of water rights and water use are maintained by the States agencies statutorily charged with that responsibility.