Exempel på polder

• Powerful pumps keep the polders from flooding.

• A polder is a large area of land containing farms and villages encircled by dykes.

• The polder system could isolate the flooding to a smaller area.

• Following the damming, large areas of land were reclaimed in the newly freshwater lake body by means of polders.

• The coastal plain consists mainly of sand dunes and polders.

• After a few centuries, an additional way to keep the polders dry was required.

• Kennemerland was a duneland, where the farmers had far fewer rights than the farmers in the polders.

• Amphirols are used for ground surveying, for grooving the surface of newly drained polders to assist drying, and to carry soil-drilling teams.

• Drained lakes and new polders can often be easily distinguished on topographic maps by their different regular division pattern as compared to their older surroundings.

• The sky above the polders began to play a more important role.

• The first consists mainly of sand dunes and clayey alluvial soils in the polders.

• The polders include 33 km of canals, 177 km of levees, and 129 hydrotechnical structures.

• Starting around the 16th century, they took the offensive and began land reclamation projects, converting lakes, marshy areas and adjoining mudflats into polders.

• Other technological advances that have increased the carrying capacity of the world relative to humans are: polders, fertilizer, composting, greenhouses, land reclamation, and fish farming.

• In the process valuable expertise was built up in throwing up banks, reclaiming polders and embanking rivers.

• Constructing polders in this way is called "inning" or "reclaiming" from the sea.

• From circa 1600 on, peat extraction became important and resulted in the formation of large ponds, which in turn would be made into polders later on.

• Other polders followed in 1657 and 1663.