Award Date


Degree Type


Degree Name

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

Controlled Subject


File Format


File Size

3205.12 KB

Degree Grantor

University of Nevada, Las Vegas




If you are the rightful copyright holder of this dissertation or thesis and wish to have the full text removed from Digital Scholarship@UNLV, please submit a request to and include clear identification of the work, preferably with URL.


IN COPYRIGHT. For more information about this rights statement, please visit