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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 />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- <br />time decisions to be made. Changes in basin operations and administration will be <br />determined based on information gathered through the interviews with water <br />commissioners, division engineers, and water managers outlined in Task 3. The effects <br />of these changes with regard to achieving the SPDSS objectives identified in the <br />feasibility study will be documented for the 1950 to 2002 study period. Although the <br />modeling efforts will consider the entire study period during calibration, <br />recommendations will be made for more focused calibration and validation efforts. <br />Deliverables: <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, atime-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 />Task 2 -Identify and Fill Key Streamflow Gage Records <br />Background: <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 />Objective: <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 />Approach: <br />2.1 Identify key streamflow gages in the South Platte, North Platte, and Laramie River basins <br />which have good or excellent records, based on the USGS ratings. Key streamflow gages <br />should have at least 70 percent of the records complete throughout the SPDSS study <br />SPDSS Consumptive Use and Water Budget Component 4 <br />