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<br /> <br />01/28/99 THU 09:49 FAX 1 50541j76188 <br /> <br />STATE ENGINEER OFFICE <br /> <br />1aJ002 <br /> <br />. <br /> <br />o <br />o <br />(-:) <br />C.LI <br />---J <br />~ <br /> <br />DR/( FT <br /> <br />SAN JUAN RIVER RECOVERY IMPLEMENTATION PROGRAM <br />COMMITTEE ON SECTION 7 PROCEDURES <br /> <br />ISSUES STATEMENT ON USE OF HYDROLOGIC MODELING <br />January 28, 1999 <br /> <br />The Bureau of Reclamation in past Endangered Species Act <br /> <br />Section 7 consultations on the Animas-La Plata Project utilized a <br /> <br />Fortran-based hydrologic model for the San Juan River 13asin to <br /> <br />evaluate the hydrologic impacts on the San Juan River of various <br /> <br />river and reservoir operation scenarios_ The Bureau of Reclamation <br /> <br />and the Bureau of Indian Affairs now have developed a Riverware- <br /> <br />based hydrologic model for the Basin to evaluate the impacts on <br /> <br />river flows of various operation scenarios. The Riverware model <br /> <br />also is tied to data pre-processors and model output post- <br /> <br />processors for handling time steps of less than One month and <br /> <br />evaluating flow statistics. Both models have limitations. <br /> <br />To evaluate revisions to projected Animas-La Plata Project <br /> <br />operations, the Fortran model currently must be used to generate <br /> <br />input to the Riverware model. The Riverware model was used by the <br /> <br />Bureau of Indian Affairs to provide input to the Biology Committee <br /> <br />of the San Juan River Recovery Implementation Program for making <br /> <br />secondary flow recommendation criteria to shape San Juan River <br /> <br />hydrographs through endangered fish critical habitat below <br /> <br />I <br />