Master of Science (MS)
Number of Pages
Under natural conditions in Las Vegas Valley the shallow aquifer was recharged by upward leakage of ground water from the principal aquifer. Presently recharge to the shallow aquifer is infiltration from over-irrigation which poses a potential threat to the quality of the principal aquifer. To evaluate this contamination potential, water levels from monitoring wells in both aquifers were collected, a three dimensional finite difference ground-water flow model (MODFLOW) was developed to estimate volume and velocity of potential leakage, and water quality samples were collected; Water levels collected in the shallow aquifer show a dependency on potentiometric head in the principal aquifer. A linear regression analyses showed good correlation of water level changes in the shallow aquifer due to injection and pumping operations in the principal aquifer with increasing correlation coefficients with shallow aquifer depth; These analyses indicate that within the District's main well field, the primary source of shallow aquifer ground water is the principal aquifer and that potential contamination from the upper poorer quality ground water (due to evapotranspiration) is not a present threat due to very slow vertical leakage. (Abstract shortened by UMI.).
Aquifer; District; Estimation; Field Leakage; Main; Nevada; Principals Shallow; Valley; Vegas; Water; Well; Las Vegas
University of Nevada, Las Vegas
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Bernholtz, Alan Joseph, "Estimation of leakage between the shallow and principal aquifers in the Las Vegas Valley Water District's main well field, Las Vegas, Nevada" (1993). UNLV Retrospective Theses & Dissertations. 317.