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Technical <br />Brief <br />Memorandum <br />Description <br />Detailed Description <br />No. <br />Summarizes results of the search performed to locate past studies <br />A <br />References <br />conducted in or near the Tamarack SWA. This search includes the USGS3 <br />online library, USGS Denver Library, DOW files, and conversations with <br />Chuck Roberts SEO4 and Alan Burns (USGS <br />The geology near the Tamarack SWA was investigated to provide data and <br />B <br />Geology <br />information for the design and construction of a groundwater flow model <br />for the South Platte River alluvial aquifer <br />All available data on aquifer properties near the Tamarack SWA were <br />C <br />Hydrologic <br />compiled. In addition, data from three previously unreported aquifer <br />Parameters <br />performance tests were located and evaluated to determine hydraulic <br />conductivity andspecific yield. <br />D <br />Evapotranspiration <br />Describes how the evapotranspiration input was derived for the Tamarack <br />Recharge Model <br />Water Level Data <br />Describes the water level monitoring network used to calibrate the model. <br />E <br />and Surveying <br />Four surface water locations and 53 groundwater locations, for a total of 57 <br />locations, are monitored at the Tamarack SWA . <br />F <br />Grid and Boundary <br />This memorandum describes the model grid and boundary conditions <br />Conditions <br />assigned to the Tamarack Recharge Model. <br />Well Pumping <br />G <br />and Recharge <br />Describes how the data files for well pumping and recharge were derived <br />Data <br />for the Tamarack Recharge Model <br />H <br />Calibration <br />Describes the calibration process and results for the Tamarack Recharge <br />Model. <br />During operation and calibration of the Tamarack Recharge Model, it was <br />noticed that the recharge operations significantly impacted the western <br />boundary of the Tamarack Model. Upon review, the authors decided to <br />Expansion and <br />extend the western boundary of the Tamarack Model. In addition, the time <br />I <br />Recalibration <br />frame of the model was expanded to include all recharge operations. The <br />time span included in the updated model is from February 1, 1997 to <br />October 31, 2002. This memorandum describes the details of the process <br />to extend the model to the west, expand the model time span and to <br />recalibrate the model. <br />The West Expanded Tamarack Recharge Model was used as a baseline to <br />analyze the return of ground water pumped as part of the Tamarack <br />7 <br />River Recharge <br />Recharge Project to the South Platte River. The two components of the <br />Evaluation <br />river recharge analysis include 1) determining the amount and distribution <br />of river recharge and 2) comparing the recharge to Stream Depletion <br />Factors SDFs <br />This analysis describes the sensitivity of head calibration and river recharge <br />K <br />Sensitivity <br />in the Tamarack Recharge Model to changes in model parameters such as <br />Analysis <br />hydraulic conductivity, specific yield, river constant head boundary and <br />recharge. <br />3 United States Geologic Survey <br />4 State Engineers Office <br />Model Description <br />Page 3 of 6 <br />