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<br />2.0 Data Inventory <br /> <br />Key water supply and water use studies conducted by federal, state and water user organizations <br />within the last 15 years were identified and tabulated into a bibliography. In addition, <br />histograms were prepared for each Water Division to provide an indication of historic water <br />supply and drought periods over time. <br /> <br />2.1 Bibliography <br /> <br />A bibliography of approximately 7,500 key water supply and water use studies conducted by <br />federal, state and water user organizations within the last 15 years has been developed. This <br />was accomplished by combining a search of the United States Geologic Survey library with local <br />knowledge provided by the reviewers of this report (Division of Water Resources, Colorado <br />Water Conservation Board, and water user organizations). The bibliography is compiled in a <br />database that can now be searched by key words such as state water division, author, date, river <br />basin, drought, and interstate compact, and will be of assistance to water resource managers in <br />researching available literature in the state. The bibliography is not attached to this report due <br />to its size, however, a printout is available upon request. <br /> <br />2.2 Division Histograms <br /> <br />Figures 2.1 through 2.7 are histograms that display annual flow volumes over time for three <br />selected stream flow gages in each State Water Division. The gages were selected by location <br />to provide an indication of water supply at different places within each Division. All Division <br />histograms include one or more gages that represent flows from Colorado to downstream states. <br />The Division of Water Resources operates and maintains more than 200 gaging stations <br />throughout the state which supply stream flow data to support the administration of water rights <br />and provide data for various water resource studies. The United State Geologic Survey also <br />maintains and operates another 200 stations. <br /> <br />In reviewing the histograms, the solid horizontal lines shown on Figures 2.1 through 2.7 depict <br />the average historic stream flow at each gage. Stream flow volumes below the average represent <br />droughts of various duration and severity. For example, Figure 2.1 shows the average flow of <br />the South Platte River near Kersey is approximately 880,000 acre-feet per year. It also indicates <br />that relatively severe droughts occurred in the 1930's and again in the 1950's. Further, it <br />indicates drv vears as _beinlZa fairlv freauent occurrence. emnhasizinlZ the need for drv v~r <br /> <br />repayment studies. Presently, this provides the best indicator as to how the unused compact <br />apportionment may be fully used in the future. <br />