Polders by Kian Lawler

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Polders

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Holland's polder land was once covered by the sea, but it was eventually encircled by dikes and dams, then drained. To pump out all that water, the Dutch used one of their leading natural resources: the wind.

Parts of Amsterdam are 4 meters below sea levels, other parts are 2 meters above sea level. The lowest part in Holland is 6 meters below sea level! Still, the Dutch aren't worried about flooding because they have a innovative system of dykes, dunes, canals and barrages to break the water.

Parts of Amsterdam are 4 meters below sea levels, other parts are 2 meters above sea level. The lowest part in Holland is 6 meters below sea level! Still, the Dutch aren't worried about flooding because they have a innovative system of dykes, dunes, canals and barrages to break the water.

Netherlands' literally means lower countries referring to its low land and flat geography with only about 50% of its land exceeding 1 metre 3 ft 3 in above sea level.

Large areas of the Netherlands are sinking, often to below sea level.the Netherlands is a bathtub that could fill up completely in case of flooding,according to one researcher. But the authorities say there is no cause for alarm. Sea and river water is kept out by natural sand dunes and man-made dykes.

The ground level in drained marshes subsides over time. All polders will eventually be below the surrounding water level some or all of the time. Water enters the low-lying polder through infiltration and water pressure of ground water, or rainfall, or transport of water by rivers and canals. This usually means that the polder has an excess of water, which is pumped out or drained by opening sluices at low tide. Care must be taken not to set the internal water level too low.