Hydrogeology and vulnerability to contamination of major aquifers in Alabama; area 13

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Authors:Gillett, Blakeney; Raymond, Dorothy E.; Moore, James D.; Tew, Berry H.
Author Affiliations:Primary:
Geological Survey of Alabama, Tuscaloosa, AL, United States
Source:Circular - Geological Survey of Alabama, No.199-A, 68p. Publisher: Geological Survey of Alabama, Tuscaloosa, AL, United States. ISSN: 0097-3149
Publication Date:2000
Note:In English. 48 refs. Color hydrogeologic map ; Color site location map ; compact disc 1
Summary:The Geological Survey of Alabama (GSA), in cooperation with the Alabama Department of Environmental Management (ADEM), is revising and expanding a series of reports that delineates the major aquifers in Alabama and characterizes their vulnerability to contamination. The original reports were prepared by the U.S. Geological Survey in cooperation with ADEM. The state is divided into 13 areas that are addressed in separate reports. The hydrogeology and vulnerability to contamination of the major aquifers in Area 13, which includes Baldwin and Mobile Counties, are described in this report, which currently is available only in digital format. The major aquifers in the study area are the Miocene-Pliocene aquifer and the watercourse aquifer (alluvial-coastal aquifer of Mooty, 1988). The Miocene-Pliocene aquifer consists of the Citronelle Formation and the undifferentiated deposits of the Miocene Series. No continuous confining unit exists between the Citronelle Formation and the shallow part of the Miocene Series undifferentiated, and as a result, the two units generally act as a single aquifer. The Miocene Series undifferentiated, however, does not appear to be a single aquifer. New deep well data available from central Mobile County and southern Baldwin County suggest that the Miocene deposits in both counties may be subdivided into at least two separate aquifers. The recharge areas for these aquifers include all of Mobile and Baldwin Counties and parts of Washington County. The soils throughout most of the study area are highly permeable and allow rapid infiltration of surface water. Consequently, the shallow unconfined aquifers in the study area are considered highly vulnerable to surface sources of contamination. Aquifers become less vulnerable to contamination from the surface with an increasing degree of confinement by clay layers. However, even deep aquifers can be vulnerable to natural sources of contamination such as salt water from the Gulf of Mexico and mineralized ground water.
Subjects:Aquifer vulnerability; Aquifers; Deep aquifers; Ground water; Hydrogeologic maps; Hydrostratigraphy; Maps; Pollution; Recharge; Site location maps; Surface water; Water pollution; Water supply; Alabama; Baldwin County Alabama; Mobile County Alabama; United States; Washington County Alabama; Color hydrogeologic map; Color site location map
Coordinates:N303000 N313000 W0875000 W0881500
Record ID:2018057588
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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