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0 <br />• <br />0 <br />WATER LEVELS IN THE DENVER BASIN <br />BEDROCK AQUIFERS, SPRING, 1991 <br />By John C. Romero <br />and <br />Howard C. Bainbridge <br />The purpose of this report is to provide measurements of depth to the spring, 1991 ground water <br />level, depths to ground water level for five measurements taken prior to 1991 (where available), <br />and water level change calculations for 1988-1991 and 1990-1991. Included are a number of <br />representative hydrographs. The measurements were recorded by either the well driller, the <br />Colorado Division of Water Resources, U.S. Geological Survey personnel, or by water distribution <br />and supply company personnel. <br />A cursory analysis of the data in the tables reveals that, of the wells from which appropriate data <br />has been obtained, approximately 70 percent have experienced a water level decline during the <br />periods 1988-1991 and 1990-1991. The average water level decline for most exempt wells <br />completed in the Dawson, Denver, and Arapahoe aquifers during the period 1988-1991 is 1.6 feet <br />per year. The average decline for the Laramie -Fox Hills aquifer during the same period is 4.1 feet <br />per year. The average water level decline for the period 1990-1991 is 5.6 feet per year for the <br />i Dawson, Denver, and Arapahoe aquifers, and 2.1 feet per year for the Laramie -Fox Hills aquifer. <br />The increase in the rate of water level decline in the Dawson, Denver, and Arapahoe aquifers is <br />undoubtedly a reflection of the overall basin -wide increase in the utilization of these aquifers. The <br />apparent decrease in the rate of water level decline in the Laramie -Fox Hills aquifer might be <br />coincidental with measurements taken after a long recovery period. <br />In most of the municipal wells evaluated, water levels are declining at rates as low as 3 feet per <br />year in the Dawson aquifer, to 64 feet per year in the Arapahoe aquifer. It should be noted that <br />some water level measurements are taken shortly after a pumping period. A more thorough water <br />level analysis will be undertaken for the 1993 report. <br />JCR/clf:denverbasin <br />0 <br />