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RGDSS Memorandum <br />Final <br />TO: Ray Bennett <br />FROM: Ed Armbruster, Hydrosphere <br />SUBJECT: RGDSS Surface Water, Task 3.2 -Review Previous Modeling Efforts in the <br />San Luis Valley <br />DATE: April 6, 1999 <br />CC: Randy Seaholm <br />Introduction <br />This memorandum represents the delivery requirement associated with Task 3.2, Review Modeling <br />Documentation /Summary Memoranda. The objective of this task is as follows: <br />Prepare a memorandum describing significant previous surface water modeling efforts in <br />the San Luis Valley. <br />Task 3.1, Compile Information on Previous Modeling Efforts in the San Luis Valley, identified two <br />significant previous modeling efforts: the Conejos River Planning Model, developed by <br />Hydrosphere Resource Consultants, Inc. in 1993, and a model of the Rio Grande River developed by <br />Leonard Rice Consulting Water Engineers, Inc. in 1990 as part of the Rio Grande Water Supply <br />Study. <br />Conejos River Planning Model <br />Purpose of the Model <br />Development of the Conejos River Planning Model was commissioned by the Conejos Water <br />Conservancy District (the District). The Conejos River Planning Model (CRPM) was developed to <br />support a change case in the Division 3 Water Court allowing the use of Platoro Reservoir as an <br />alternate point of diversion for existing direct flow water rights. The model also could be used as a <br />tool to allow the District, the ditches in the District and the Division Engineer to experiment with <br />different operating schemes for Platoro Reservoir to determine how the reservoir may best be <br />utilized to benefit all water users in the basin. <br />Modeling System <br />The Conejos River Planning model is an application of a proprietary modeling system developed by <br />Hydrosphere Resource Consultants, Inc. called the Central Resource Allocation Model (CRAM). <br />The purpose of the CRAM system is to provide the capability to translate a water resources problem <br />that has been stated using high level concepts into a form amenable to solution by a network <br />algorithm. <br />The CRAM system adapts a network solution technique to river basin and water supply modeling. <br />CRAM utilizes the Out-of-Kilter Algorithm (OKA) to solve a network given an objective function <br />(e.g. maximize water deliveries to users) subject to specific constraints specified by the user (e.g. <br />C:\cdss\Task3Mem.doc Review Previous Modeling Efforts Apri16, 1999 -Page 1 of 11 <br />