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Previous Studies <br />A literature review of past water resources studies within Colorado was performed to investigate the <br />historical and/or synthetic periods of record that were used, and techniques with which they were <br />selected and obtained. The review focused primarily on studies on Colorado's western slope and <br />included drought analyses, water supply studies, feasibility studies, and hydrologic model <br />development. <br />Estimate historical diversion <br />and reservoir data <br />Naturalize flows using <br />StateMod or another technique <br />Statistics and data fill or <br />stochastic data generation <br />Estimate demands <br />Run StateMod <br />With estimated flows and demands <br />Results <br />Twenty-five reports and papers were reviewed. Nineteen covered areas within Water Divisions 4, <br />5, 6, and 7 on the western slope, three were within Divisions 1 and 3 on the eastern slope, and two <br />covered both slopes because of the Colorado-Big Thompson water transfer across the continental <br />divide. Two papers covered the same study, for a total of twenty-four studies reviewed. <br />The amount of information obtained from each report varies due to the contribution of information <br />from various sources, and the level of detail presented in the reports. Primary focus was given to <br />the availability of historical data for each study, techniques that were used in selecting the study <br />period and filling or extending the records, and approaches taken to remove the impact of man from <br />the gage records before date filling or generation was performed. Exhibit 1 contains a summary of <br />the periods of record obtained from all of the studies. Exhibit 2 presents information obtained from <br />the reports that were reviewed in greater detail, including historical availability of data, basis for <br />selection of the study period, techniques used in filling, extending, or generating data, and whether <br />or not efforts were made to remove man's impact on the gage data. <br />The study periods of record ranged from 6 to 73 years within the period 1906 to 1993. Although <br />they appear highly variable, when studied more closely, a common period of record becomes <br />Appendix E E-2 <br />