Fresh water

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Water, water, everywhere,
And all the boards did shrink;
Water, water, everywhere,
Nor any drop to drink.
The Rime of the Ancient Mariner


Reverse Osmosis

In the boating world, reverse osmosis machines are also called "watermakers".

Rainwater Harvesting

Rain is responsible for depositing most of the fresh water on the planet, most of it over the ocean (see wikipedia).

If you ever lived in a tropical country, you quickly learn to espect a daily rain fall between 5 and 6 o'clock of about half an hour. And collecting rain fall is the easy. With a permeable soil, you even have nothing to do.

Post on collecting rain.


The Watermill

Fresh water lens

Ghyben-Herzberg lens

Human can survive about anywhere provided there is enough fresh water. Moreover, fresh water is lighter than sea water.

So the best place to live is on top of a mass of porous materiel saturated of fresh water (like a kitchen sponge). In natural island it is known as the Ghyben-Herzberg lens.

The water may be collected from rain. If the island is large and deep enough (40 times deeper that its height), it will be naturally protected against salt water intrusion. Otherwise, some watertight barrier is needed.


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