{"id":{"repo_id":"unlv","oai_identifier":"oai:oasis.library.unlv.edu:rtds-1316"},"canonical_url":"https://search.dev.ndltd.org/etd/unlv/oai:oasis.library.unlv.edu:rtds-1316","repository":{"repo_id":"unlv","name":"University of Nevada - Las Vegas","base_url":"https://oasis.library.unlv.edu/do/oai/"},"display":{"title":"Estimation of leakage between the shallow and principal aquifers in the Las Vegas Valley Water District's main well field, Las Vegas, Nevada","abstract":"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.).","abstract_html":"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.).","abstract_has_math":false,"creators":["Bernholtz, Alan Joseph"],"institution":"University of Nevada, Las Vegas","degree_name":"Master of Science (MS)","degree_level":"Thesis","degree_discipline":"Geoscience","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1993,"date_issued":"1993-01-01T08:00:00Z","date_published":"1993-01-01T08:00:00Z","updated_at":"2026-07-24T05:24:22Z","subjects":[],"languages":["English"],"rights":["IN COPYRIGHT. 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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.)."]},{"key":"dc:format","label":"Dc Format","values":["pdf"]},{"key":"dc:title","label":"Title","values":["Estimation of leakage between the shallow and principal aquifers in the Las Vegas Valley Water District's main well field, Las Vegas, Nevada"]}]}],"canonical_facts":{"dc:creator":["Bernholtz, Alan Joseph"],"dc:description.abstract":["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.)."],"dc:format":["pdf"],"dc:identifier":["10.25669/9ttv-igbz","https://oasis.library.unlv.edu/rtds/317","https://oasis.library.unlv.edu/context/rtds/article/1316/viewcontent/uc.pdf"],"dc:language":["English"],"dc:publisher":["University of Nevada, Las Vegas"],"dc:rights":["IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["Estimation of leakage between the shallow and principal aquifers in the Las Vegas Valley Water District's main well field, Las Vegas, Nevada"],"dc:type":["Text"],"thesis:degree_discipline":["Geoscience"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T05:24:22Z"}