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General Conclusions <br />^ The water level data collected, analyzed, and presented in this TM represent an <br />important addition to the knowledge and characterization of the groundwater system <br />within the South Platte Alluvium Region. The information presented here depicts the <br />water table configuration for six periods over the past 40 years, presents the trends in <br />water levels at a basin-wide level and provides a more detailed perspective on water <br />level changes over time from 44 individual hydrographs. This task of the SPDSS has <br />compiled a database of water level measurements from 6,754 unique alluvial wells with <br />over 108,843 water level measurements in the South Platte Alluvium Region. <br />^ Many of these data are being presented in this Task 44 for the first time in a publicly <br />accessible report and electronic database (HydroBase). The water level data and <br />mapping are the most comprehensive currently available. <br />^ Water levels in the alluvial aquifer within the study area have remained stable over the <br />past 20 to 30 years in most locations based on spring measurements. Areas showing <br />water level declines include Box Elder Creek and the lower portion of Bijou Creek <br />within the Kiowa-Bijou Designated Basin. <br />^ The water level surfaces presented in the TM are consistent with those presented in the <br />earlier reports by Hurr and Schneider (1972). However, the source data from those <br />reports is not available so the water table maps in this TM represent the best available <br />data-supported mapping of the alluvial aquifer water table. <br />^ The water level database as presented in this TM is sufficient for regional-scale water <br />resources planning and for developing a groundwater model in the South Platte <br />Alluvium Region. <br />Specific Conclusions <br />^ Task 44 activities satisfy the objectives of collecting available published water level data, <br />analyzing the data, enhancing HydroBase with these data, guiding the SPDSS field <br />investigations, and helping characterize groundwater flow and water levels in the South <br />Platte Alluvium Region. <br />The Task 35 and 39 data have helped fill previous water level data gaps and helped <br />characterize the alluvial water level surface trends in the South Platte Alluvium Region. <br />In Phase 1, Task 35 wells were installed to provide water level data and fill aquifer <br />property data gaps. In Phase 2, Task 35 wells were installed at tributary mouths and at <br />stream gage locations to better understand groundwater fluxes at these locations, with <br />water level data presented under Task 39. <br />Based on spring season measurements, water levels in the South Platte Alluvium Region <br />have generally remained relatively stable over time. Exceptions to this are in areas of <br />Morgan and Weld Counties, where water levels have declined in excess of 20 feet in the <br />past 75 and 18 years, respectively, and in the Kiowa and Lost Creek Designated Basins, <br />where water levels also have declined in recent years. The saturated thicknesses in these <br />areas were 100 feet and 175 feet respectively. <br />SPDSS Phase 3 Task 44.3 TM -Final 15 <br />11/29/2006 <br />