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CRAM is a generic modeling tool that allows representation of a river basin using a network of arcs <br />and nodes, and solves this network using an optimization technique. Amore thorough description of <br />the CRPM is provided in a memorandum documenting work efforts under Task 3.2, Review of <br />Previous Surface Water Modeling Efforts in the San Luis Valley. <br />Rio Grande Water Supply Study <br />The Rio Grande Water Supply Study (Leonard Rice Consulting Water Engineers, Inc., 1990) was <br />commissioned by the San Luis Valley Water Conservancy District and the Colorado Water <br />Conservation Board to examine the legally and physically available flow (storable flow) at four <br />potential reservoir sites in the Rio Grande Basin upstream of Del Norte, Colorado. As part of this <br />Rio Grande Water Supply Study, a computer tool (RIBSIM) was applied to help organize and <br />analyze data directed at quantifying storable River yield under different administrative and <br />operational scenarios. The model was operated on a monthly time step over a study period <br />encompassing 1948 through 1985. <br />The River Basin Simulation (RIBSIM) model is a generalized computer program that can be used to <br />estimate storable flows at potential reservoir sites considering various water supply and water use <br />scenarios. The RIBSIM model is configured to a river basin by the definition of water uses, return <br />flows, reservoirs, instream flow requirements, etc. to be superimposed on a flow network. The <br />model uses traditional accounting methodology to allocate water supplies to uses by the prior <br />appropriation doctrine. The allocation is performed for each month of the modeled period based on <br />user assigned priorities of the water rights. Amore thorough description of the RIBSIM application <br />to the Rio Grande River is provided in a memorandum documenting work efforts under Task 3.2, <br />Review of Previous Surface Water Modeling Efforts in the San Luis Valley. <br />Other Modeling Efforts Identified <br />Upper Rio Grande Water Operation Modeling <br />The Upper Rio Grande Water Operations Modeling (URGWOM) project is being sponsored by six <br />Federal agencies (Bureau of Reclamation, U.S. Fish and Wildlife Service, U.S. Geological Survey, <br />Bureau of Indian Affairs, International Boundary and Water Commission, and the U.S. Army Corps <br />of Engineers). This is a cooperative effort to develop an operational model capable of simulating <br />and assisting with water storage and delivery operations in the Rio Grande Basin from its headwaters <br />in Colorado to Fort Quitman, Texas. The primary purpose of URGWOM is to improve the <br />availability, timeliness, completeness, and accuracy of information and data related to water storage, <br />deliveries, depletions and flood control operations. The project is currently under development and <br />is expected to be completed in 2001. <br />The URGWOM model of the Rio Grande basin will utilize computer software called RiverWare <br />(formerly known as PRYSM). RiverWare is a generic reservoir and river system modeling software <br />tool that can be customized to fit specialized modeling needs. RiverWare was developed in a <br />collaborative effort by the Center for Advanced Decision Support for Water and Environmental <br />Systems (University of Colorado), the Bureau of Reclamation, and the Tennessee Valley Authority. <br />RiverWare utilizes a data centered approach similar to that of Colorado's Decision Support Systems. <br />An in-depth review of the URGWOM effort was not performed as part of Task 3 of the Surface <br />Water Modeling Scope of Work because 1) the software has not been completed; and 2) <br />representation of the Rio Grande Basin within the State of Colorado will (initially) be limited to very <br />simplified characterizations of inflows and depletions. <br />C:Acdss\Tsk3aMem.doc Previous Modeling Efforts April 6, 1999 -Page 3 of 4 <br />