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SPDSS Memorandum <br />Final <br />To: Ray Alvarado and Ray Bennett <br />From: LRE, Erin Wilson and Mary Presecan <br />Subject: Task 4 -Identify and Fill/Resolve Conflicting Records for Key <br />Transmountain Diversion Structures <br />Date: November 23, 2004 <br />Introduction <br />Transmountain diversions represent a major inflow component to the South Platte River <br />basin. Transmountain diversions import water into the South Platte River basin from the <br />Colorado, Arkansas, and North Platte (including the Laramie) River basins. <br />Transmountain diversion records will be used to define inflows to the basin for the basin <br />water budget and surface water modeling efforts. <br />In previous CDSS modeling efforts, it was found that many transbasin diversion records <br />were incomplete in HydroBase. Extensive effort was made to create complete historical <br />records for use in surface water and water budget modeling, and StateMod format files <br />(*.stm) were created using data both from HydroBase and from other sources. However, <br />the complete historical records were not incorporated in HydroBase as part of these <br />previous modeling efforts. Therefore, one objective of this task was to review other <br />sources and, working with DWR personnel, determine if the data should be used to fill <br />HydroBase gaps. <br />During the South Platte Decision Support System (SPDSS) Feasibility Study (FS), 19 <br />transmountain diversion structures were identified and selected for further investigation. <br />These transmountain diversion structures represent all foreign imports into the basin. <br />Diversion records for each transmountain structure are currently or have historically <br />been maintained by the Colorado Division of Water Resources (DWR), recorded by the <br />United States Geologic Survey (USGS), and/or measured by owners of the diversions. <br />The objective of this task is to select the most reliable transmountain diversion data as <br />follows: <br />1. Collect transmountain diversion records for the 19 transmountain diversions from <br />the various sources including, but not limited to, DWR as stored in HydroBase or <br />on paper records, project owners/operators, and from USGS gages, <br />2. Compare records from various sources and identify conflicts within the study <br />period of 1950 to the most recent data available, <br />3. Initiate discussions with DWR personnel and project owners to determine the <br />potential cause of discrepancies, resolve conflicting records, and fill missing gaps <br />in HydroBase, and <br />Page 1 of 19 <br />