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Quarterly Journal of Engineering Geology and Hydrogeology
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Quarterly Journal of Engineering Geology and Hydrogeology; 1976; v. 9; issue.4; p. 291-302;
DOI: 10.1144/GSL.QJEG.1976.009.04.02
© 1976 Geological Society of London

Article

A study of fresh water lens configuration in the Cayman Islands using resistivity methods

Stephen Fredrick Bugg* & John William Lloyd{dagger}

* Richards and Dumbleton International, Consulting Civil Engineers, , 4 Temple Row, Birmingham B2 5HR
{dagger} Department of Geological Sciences, University of Birmingham, , P.O. Box 363, Birmingham B15 2TT

The problems of identifying the base of fresh water lenses in oceanic islands are discussed. A study carried out in the Cayman Islands is described in which the lens base is defined in relation to potable water standards and mapped using surface resistivity measurements with salinity profile controls in boreholes. Using depth-salinity ratios the piezometric surface is then determined. The technique is considered to provide a reliable cheap and rapid method of obtaining lens geometry in oceanic islands particularly where fairly homogeneous lithologies are present.




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