Abstract
Potable ground water supplies on oceanic islands are in the form of freshwater lenses floating on the more dense salt water. Indiscriminate pumping of this water can result in its contamination by salt water. The extent of the fresh water lens on long oceanic islands is predicted from results of a Hele-Shaw model study. The locations of the freshwater free surface and the freshwater-salt-water interface are presented graphically as a function of soil characteristics, island dimensions, and average infiltration rate. The effect of pumping from a horizontal gallery located at the island midpoint is also presented graphically. The maximum safe pumping rate for a horizontal gallery located at the island midpoint is predicted as a function of the net average infiltration rate.
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