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<br />. <br /> <br />. <br /> <br />1.1 Quantify the range of hydrologic events included (flood and drought events) in the <br />proposed 1950 to 2002 study period. The study period should include wet, dry, and <br />average periods while representing the long-term average hydrologic conditions in the <br />basin. It is anticipated that eight streamflow gages on the mainstem and tributaries to the <br />South Platte River, one streamflow gage in the North Platte River Basin, and one <br />streamflow gage in the Laramie River Basin will be reviewed. <br /> <br />1.2 Identify significant changes in management, operations and administration during the <br />1950 to 2002 study period. The South Platte River basin has experienced significant <br />growth during the proposed study period resulting in new reservoirs and changes in <br />operations and management of existing water delivery systems. In addition, the <br />administration of the basin has become more efficient as technology has enabled real-time <br />decisions to be made. Changes in basin operations and administration will be determined <br />based on information gathered through the interviews with water commissioners, division <br />engineers, and water managers outlined in Task 3. The effects of these changes with <br />regard to achieving the SPDSS objectives identified in the feasibility study will be <br />documented for the 1950 to 2002 study period. Although the modeling efforts will <br />consider the entire study period during calibration, recommendations will be made for <br />more focused calibration and validation efforts. <br /> <br />Deliverables: <br /> <br />1.1,1.2 A technical memorandum recommending the appropriate study period based on results <br />of the investigations above. The memorandum will include figures showing that the <br />study period exhibits the recommended hydrologic variability, a time-line of significant <br />management, operation, and administration changes during the recommended period <br />plus recommended periods for more focused calibration and validation efforts. <br /> <br />Task 2 . Identify and Fill Key Streamflow Gage Records <br /> <br />Background: <br /> <br />Streamflow data are required for the surface water modeling efforts and for use in estimating <br />average, wet, and dry months for the "pattern fill" technique for filling diversion records used in <br />CRDSS and RGDSS. Historic and estimated streamflow data will be used in the development of <br />baseflows for the surface water modeling. The SPDSS Feasibility Study determined that <br />approximately 63 streamflow gages were at least 70 percent complete during the 1950 through <br />2000 period reviewed. <br /> <br />Objective: <br /> <br />To identify key streamflow gages that have good or excellent records (as defined by the USGS), <br />have at least 70 percent of the records complete throughout the SPDSS study period, or represent <br />the best data available at key locations in the South Platte, North Platte, and Laramie River <br />basins. Fill missing records on a monthly basis. <br /> <br />Approach: <br /> <br />SPDSS Consumptive Use and Water Budget Component <br /> <br />12 <br />