Do islands have a water table?

Some oceanic islands' water tables are determined by the tides. On these islands, freshwater seeps down to intersect with pockets of seawater that collect in porous soil. The denser seawater stays beneath the freshwater, causing the water table to rises and fall with the tides.



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Currently, desalinated ocean water is the primary source of drinking water, providing 90% of the potable water on the island, supplemented by groundwater (Water Sewerage Corporation, 2022b).

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Ocean water is clear due to the shallow sandy plateau of the Bahamas. Ocean depths are only 10 — 30m with white sand bottom for miles around the islands. Crystal clear.

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Niihau, also known as the Forbidden Isle, is a beautiful small island in Hawaii spread across 180 sq km. The island is off-limits to outsiders and only the Robinson family, their relatives, invited guests, government officials and US Navy personnel are allowed here.

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