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percent and five percent, respectively, of the entire grid area. Both grids were revised so <br />the bottom of alluvium and water table elevations greater than ground surface were set <br />equal to ground surface. The modified areas in the bottom of alluvium grid are limited <br />to the fringes of the South Platte alluvium and the adjustments made are considered <br />appropriate based on available data and for the purpose of regional scale modeling. The <br />groundwater level grid will be used to help define the alluvial model domain in Task 48, <br />and therefore, the ground surface adjustment to the groundwater level grid is a <br />reasonable correction for that purpose. <br />^ The alluvial aquifer configuration of the Upper Big Sandy Designated Basin and the <br />southern end of the Kiowa-Bijou Designated Basin is not characterized with as much <br />certainty as is the remaining study area. The source data available for these areas are <br />more sparse and of less confidence. <br />^ The aquifer configuration picks discussed will be provided to the SPDSS project <br />manager for inclusion into HydroBase. <br />5.0 Recommendations <br />The following additional data needs were identified based on this Phase 3 data analysis: <br />^ The aquifer configuration data collected under Task 42 of the SPDSS and presented both <br />in this TM and in HydroBase are the most comprehensive, readily available data and <br />should be utilized by members of government agencies, water management groups and <br />the public in water resources-related activities in the South Platte Alluvium Region. <br />The configuration data for the Upper Big Sandy Designated Basin in Division 2 and the <br />southern end of the Kiowa-Bijou Designated Basin is presented with less detail than <br />other historical reports for other regions of the South Platte Alluvium. The SPDSS will <br />not be including the Upper Big Sandy alluvial system and much of the southern end of <br />the Kiowa-Bijou area in its Task 48 alluvial model, so no additional characterization is <br />needed for the SPDSS. However, more data collection is recommended if localized <br />groundwater modeling is conducted in the southern end of the Kiowa-Bijou, or if <br />groundwater modeling is undertaken in the Upper Big Sandy for the future Arkansas <br />River Decision Support System. <br />^ The alluvial aquifer configuration information developed from digitized contour maps <br />represents derived data. Therefore it should be retained in a database separate from <br />HydroBase for use in conjunction with HydroBase data for future analysis, mapping, <br />and modeling of the South Platte Alluvium Region. <br />If more localized study is conducted in the areas where ground surface was used to <br />adjust the grids or where the bottom of alluvium grid had a high residual compared to <br />bottom of alluvium picks, then additional data should be gathered to refine the grids in <br />those areas. <br />SPDSS Phase 3 Task 42.3 TM -Final 16 <br />11/30/2006 <br />