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<br />~. <br /> <br />" <br /> <br />, <br /> <br />Addendum No.4) <br /> <br />. <br /> <br />Chapter 14 summarizes Technical Add. No.4, which is a study of the economic life <br />of the Denver Basin aquifers funded by 5B-96-153. <br /> <br />Discussions concerning. the economic life of the Denver Basin aquifers 'have <br />occurred for more than 20 years. Denver Basin aquifer hydrogeologists realized <br />that production from the Denver Basin aquifer wells will decline over time due to a <br />reduction of the aquifers' saturated thickness caused by pumping. What is not <br />known is how water well production rates will decline and how the cost of Denver <br />Basin aquifer groundwater production will increase over time. The study <br />conducted under 5.B. 96-153 addresses these two very important questions. <br /> <br />The economic life of the Denver Basin aquifers is very complicated. The study <br />shows that, as regional water levels decline due to pumping, pumping costs <br />increase. In some areas with greater water level declines, the number of wells <br />necessary to produce the same volume of water will double or triple. <br /> <br />Model projections of regional water level declines based upon future pumping <br />scenarios in Tech. Add. No.2 appear to indicate that the economic life of the <br />Denver Basin aquifers may be longer than some sources have estimated. <br />Additional modeling studies incorporating more accurate estimates for historic and <br />present pumping withdrawals and better projections for future pumping demands . <br />would give a better estimate of future conditions in the aquifer. <br /> <br />., ~, <br /> <br />/. <br /> <br />- 14- <br />