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aquifer water level surfaces in the Denver Basin Region. Water level data loggers have <br />been installed in five dedicated bedrock monitoring wells in which measurements are <br />being collected on a daily basis to provide a better understanding of bedrock water level <br />trends and variability within a given year. <br />^ The water level data available for the Denver Basin Region bedrock aquifers are <br />distributed unevenly over the area, with very little data available in the deeper central <br />portions of each of the bedrock aquifers. Data are needed in these areas so water level <br />elevations can be mapped with a similar degree of confidence as in the areas mapped <br />and presented in this TM. <br />^ Water levels in the lower, undivided Dawson Aquifer have shown little change in recent <br />decades. Water level elevations have declined on average 0 to 5 feet per year with the <br />most significant decline of 9.5 per year in a well east of Castle Rock in Douglas County. <br />^ Water levels in the Denver Aquifer have undergone a decline in recent decades with the <br />largest declines being around the south Denver Metro area in Douglas County. Water <br />levels in these areas northwest of Parker and south of Castle Rock have declined 20 feet <br />per year on average. <br />^ Water levels in the lower, undivided Arapahoe Aquifer have shown the greatest change <br />in recent decades. Water level elevations have declined on average 25 feet per year in the <br />south Denver Metro area in Douglas County. <br />^ Water levels in the Laramie-Fox Hills Aquifer have undergone declines in recent <br />decades with the largest declines being around the south Denver Metro area in <br />Arapahoe County. Water levels in these areas have declined from 10 to 25 feet per year. <br />5.0 Recommendations <br />The following recommendations have been identified based on the Phase 3 data analysis: <br />^ The bedrock water level data collected under Task 44 of the SPDSS and presented both <br />in this Technical Memorandum and in HydroBase are the most comprehensive that are <br />currently available and should be utilized in water resource related activities for the <br />Denver Basin. <br />^ Continue bedrock water level data collection efforts from the existing monitoring <br />network, including autumn measurements planned for Task 39 in Phase 4. <br />^ Collect spring bedrock water level measurements consistently in the month of April to <br />minimize the year-to-year variability and reduce the influence of spring and early <br />summer pumping on the water level data collected. <br />SPDSS Phase 3 Task 44.2 TM -Final 17 <br />11/28/2006 <br />