Aquifer vulnerability in Alabama; public information and risk assessment

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Authors:Gillett, Blakeney; Kopaska-Merkel, David C.; Raymond, D. E.; Moore, J. D.; Tew, B. H.
Author Affiliations:Primary:
Geological Survey of Alabama, Hydrogeology Division, Tuscaloosa, AL, United States
Volume Title:Geological Society of America, Southeastern Section, 49th annual meeting
Source:Abstracts with Programs - Geological Society of America, 32(2), p.20-21; Geological Society of America, Southeastern Section, 49th annual meeting, Charleston, SC, March 23-24, 2000. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592
Publication Date:2000
Note:In English
Summary:The Geological Survey of Alabama is delineating major aquifers in Alabama and their vulnerability to contamination. The purpose is to help planners reduce the risk of contamination to existing and future public ground-water supplies. The state is divided into 13 areas to be addressed on 13 CD-ROMs that include reports in pdf format, GIS data files, and ESRI's ARC Explorer software. The reports describe geologic and hydrogeologic units; assess aquifer vulnerability; describe public water-supply sources; and include maps showing geology, aquifer recharge areas, vulnerability areas, public water-supply wells and springs, roads and streets, and potentiometric contours. The digital format allows the completed reports, including maps and illustrations, to be transmitted electronically. The reports can be downloaded from web sites. Inclusion of GIS data permits users to construct custom maps. The coastal region of Alabama, including Mobile and Baldwin Counties, is covered by the first report (Area 13). Major aquifers in Area 13 are the Miocene-Pliocene aquifer and the watercourse aquifer. The Miocene-Pliocene aquifer consists of the Citronelle Formation and undifferentiated Miocene deposits. No continuous confining unit separates the Citronelle Formation and the shallow part of the Miocene Series--the two units generally act as a single aquifer. The Miocene Series, however, is not everywhere a single aquifer. New deep well data from central Mobile and southern Baldwin Counties suggest that the Miocene deposits in Area 13 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 Area 13 are highly permeable and allow rapid infiltration of water. Consequently, 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 increasing degree of confinement. However, even deep aquifers may be vulnerable to natural sources of contamination such as salt water from the Gulf of Mexico and the subsurface.
Subjects:Aquifer vulnerability; Aquifers; Cenozoic; Citronelle Formation; Data bases; Data processing; Geographic information systems; Ground water; Information management; Information systems; Miocene; Neogene; Pliocene; Pollution; Salt-water intrusion; Tertiary; Alabama; Baldwin County Alabama; Mobile County Alabama; United States; Washington County Alabama
Coordinates:N301500 N301500 W0872000 W0882000
Record ID:2002039063
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
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