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<br />.'- --.. .. -~._- -~----.....~ '.~' <br /> <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 honzontallines 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 dry years as being a fairly frequent occurrence, emphasizing the need for dry year <br />reliability measures, such as storage, cOl\iunctive use of surface and ground water, demand <br />management, effluent reuse and exchange, interruptable supply arrangements, and other <br />measures. <br /> <br />Similar stream flow characteristics and drought periods can be identified in Figures 2.2 through <br />2.7 for each Water Division in the state. The droughts of the 1930's and 1950's are usually <br /> <br />10 <br />