Abstract
Brackish ground-water bodies under coastal areas and islands often show a regular pattern as to the form and salt content. Two types of theories give an explanation, the Badon GHijben/Herzberg (BGH) approach, based on density differences; and theories on mixing phenomena, like diffusion and disperson. The underlying assumptions of both approaches and their respective merits are discussed. The BG g approach is particularly suited to coastal strips and small islands, whereas the mixing theories give better results for more inland areas. This conclusion is illustrated by a number of case studies, two of them concerning the lowlands of the Netherlands and two others dealing with small oceanic islands. The theoretical aspects of the problem of maximum yield of individual wells and drains situated above brackish ground-water are introduced and some solutions are presented.
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