Conceptualization of groundwater flow in the shallow aquifer along the Apache reach of the San Pedro River, Cochise County, Arizona
AuthorDeane, Thomas Clarke.
Groundwater flow -- San Pedro River (Mexico and Ariz.)
Aquifers -- Arizona -- Cochise County.
Committee ChairMaddock, Thomas
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractThe Apache Reach of the San Pedro River is situated adjacent to the Apache Powder Superfund Site, in Cochise County, Arizona. An alluvial aquifer, known as the "shallow aquifer", and consisting of flood plain sediments deposited on the St. David Formation by the ancestral San Pedro River, is situated along this reach. The shallow aquifer is underlain by a thick clay unit of the St. David Formation, which provides vertical hydraulic confinement from a deeper regional artesian aquifer. Prior to shallow aquifer deposition, the ancestral San Pedro River and a local paleotributary, identified as Molinos Creek, eroded paleochannels into the top of the St. David Formation. During shallow aquifer sediment deposition, finer-grained, "overbank" sediments were deposited between the paleochannels. The overbank sediments formed contemporary a "laterally confining unit" (LCU) that isolates the western part of the shallow aquifer hydraulically from the remaining part of the shallow aquifer to the east.
Degree ProgramHydrology and Water Resources