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Windmills are a common sight on Ibiza , albeit that most of them have fallen into ruin since the arrival of more predictable motor powered pumps. Windmills aren't much use when there's no wind and can damage themselves when there's too much, whereas you simply turn on your motorized pump whenever you feel like it.
However, for a hundred years before the arrival of motorized pumps the windmill was a preferable alternative to the treadmill or horse-powered pump in the struggle to raise water from deep below this sun-scorched island.
Water is the lifeblood of the island and drought a killer, so it is fortunate that a veritable river of fresh water runs from the Pyrenees below the seabed under the Balearic islands maintaining a relatively high water table of pure water here. However, this water still has to be raised from deep below ground level.
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The first windmill was built around 1880 in the Ses Salines area and in their heyday there were as many as 150 in total. These, or their remains, are mainly to be found in the flat, low-lying areas of the island such as the area between Ibiza town and the airport, around San Antonio and in the Santa Eulalia area. This is because they need a fairly constant and unhindered wind in order to turn with sufficient force to raise water from the ground. Hills and forests slow down the movement of the air too much for this to happen. In addition to this most agriculture was concentrated in the flat low-lying areas and most of the water was used in agriculture. This water was the lifeblood of the island that enabled fruit, vegetables and livestock to flourish so that the farmers enjoyed rich crops while the islanders had the benefit of a constant and varied selection of fresh produce at their colourful markets.
Windmills work by transmitting the circular motion of the big wheel, via a connecting rod, into up and down strokes which move a piston up and down inside a pipe submerged in a well. The piston powers the pump, which produces water with every stroke. A single stroke of a large windmill could raise as much as 25 litres of water to the surface and the mill wheel made about 1,000 revolutions per hour, which meant that a little over 1,000 tons of water could be raised in a little over 24 hours! This water was collected in large tanks in elevated positions so that it could be channeled through an irrigation system into lower-lying fields.
Continued ... Click here windmills part2 |
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