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<br />. <br /> <br />003189 <br /> <br />TASK 4.A--PREPARATION OF <br />YAMPA WATER AVAILABILITY MODEL <br /> <br />Purpose <br /> <br />The purpose of this task is to prepare a model of the water resources in the study area <br />that is suitable for investigations of water availability to project elements and alternative <br />projects. <br /> <br />Responsibility <br /> <br />LRC\VE will be responsible for this task. <br /> <br />Approach <br /> <br />The project team will undertake the following activities: <br /> <br />1. Review information and conduct interviews with the Yampa River basin water <br />administrators; define major water rights, diversions, depletions, return flows, <br />and so forth that may significantly affect water availability at identified potential <br />reservoir sites; and identify the imponant river reaches to be included in the <br />water availability modeling. <br /> <br />2. Collect historic (1922 to 1987) monthly streamflow records in computer format <br />for the Yampa River basin from the HYDRODATA system. Develop relation- <br />ships between sites with historic streamflows and unmeasured sites where <br />streamflow measurements are desired. Tnese relationships will be derived from <br />correlations based on elevations, drainage basin size, and so forth, and produce <br />estimated flows during the 1922 to 1987 period. Where necessary, historic flows <br />will be adjusted for historic diversions and depletions of basin features to be <br />modeled. Flows will be placed into a form suitable for an electronic spreadsheet <br />model. <br /> <br />3. Devise a structure and calculation approach for an electronic spreadsheet for <br />use in the Yampa River basin water availability studies. Derive operating cri- <br />teria for the diversions, depletions, instream flow needs, and so forth, of the <br />Yampa River basin features to be included in the modeling. Hydrologic input <br />nodes will be assumed on the Little Snake River near Lily (USGS station) and <br />on the Yampa River near Milner. The downstream hydrologic node point will <br />be the USGS station on the Yampa River at Deerlodge Park. <br /> <br />4. Verify values calculated in the spreadsheet through comparisons \vith historic <br />data. <br /> <br />14 <br /> <br />DEN/800P/033.51 <br />