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<br />Attachment A <br />J.f1ll/rn/no;r Mnnp/ino .4 na/v..;'. <br />--.-.. ---8-- -.--"-----8 ____no -.- <br /> <br />INTRODUCTION <br /> <br />This appendix details the analysis process for determining impacts to hydrology from operation <br />of Alternative I, the Preferred Plan, and Alternative 3. The results of this modeling effort are <br />also presented. <br /> <br />. <br /> <br />Understanding the impact of the alternatives on the water resources of the San Juan River basin <br />requires modeling the complex relationships associated with multiple diversion and return flow <br />points in the basin. A number of basin-scale models exist that take hydrologic input data and <br />simulate the behavior of various processes under different sets of water allocation and <br />infrastructure management. A distinguishing feature of these simulation models is their ability to <br />assess water resource system responses over the long term. <br /> <br />There are several best-science river basin simulation models available, anyone of which would <br />be appropriate for developing and analyzing San Juan River flow recommendations. RiverWare <br />was selected primarily because of its flexibility and capability to simulate all key features within <br />the San Juan River Basin, RiverWare has been implemented in the San Juan Basin since 1998 in <br />support of assessing the relationship between flow recommendations for endangered fish in the <br />San Juan River and water development. This implementation has been completed by the U.S. <br />Bureau of Reclamation (Reclamation) and Keller-Bliesner Engineering as a consultant for the <br />U.S. Bureau oflndian Affairs (BIA). The application for this analysis is an extension of that <br />work. <br /> <br />. <br /> <br />MODELING APPROACH <br /> <br />RiverWare <br /> <br />RiverWare is a generic hydrologic modeling tool using an object-oriented design and a graphical <br />user interface (GUI) to allow users to develop data-driven and variable time-step models for both <br />planning and operational uses. Because of its flexible and extensible design, it can be readily <br />customized to fit specialized modeling needs for any river system. One of the features of <br />RiverWare is its ability to solve a river basin network (developed by the user with the graphical <br />user interface) with different controllers or solution techniques. Currently, there are three <br />different controllers: simulation, rule-based simulation, and optimization. A fourth controller for <br />water ownership and accounting is currently being developed. RiverWare has been in <br />development since 1993 and is the result of a continuing collaborative effort between the Center <br />for Advanced Decision Support for Water and Environmental Systems at the University of <br />Colorado, Reclamation, and the Tennessee Valley Authority (TV A). . <br /> <br />A model of a river system network is constructed by placing objects from a palette onto a work <br /> <br />A-I <br /> <br />00355 <br />