Drainage.

The Netherlands is a low-lying country with many lakes and most of its land is below sea level.

The outline shape of the Netherlands is its territory consisting of funnel-like bays. The geographical location of the Netherlands and the outline of the sea and land easily cause it to be invaded by seawater when encountering strong winds and waves.

To prevent seawater intrusion, the Dutch built embankments and canals around the lakes. They built dikes in relatively shallow waters and built canals around them. Canals are connected to canals, and canals are connected to the sea. And, in order to drain the water inside the dike, the Dutch placed windmills on the dike.

In this way, the water in the dam can be pumped out through the rotation of the windmill, discharged into the canal, and discharged into the sea through the connected canal. In 1229, the Dutch invented the windmill. These windmills play a role in drainage, which not only reduces the occurrence of natural disasters in the Netherlands, but also facilitates the development of the processing industry.

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The drained land has also become an important area for land reclamation in the Netherlands, bringing vitality and vitality to local economic development. The beautiful scenery formed by Dutch windmills also brings economic benefits to the development of tourism in the Netherlands.

The Dutch also used windmills to process agricultural and sideline products, and gradually developed industries such as shipbuilding, fishery, navigation, commerce, papermaking, woolen weaving, linen weaving, and food processing. This series of industrial chains are interconnected and increasingly prosperous, providing prerequisites for the development of the Netherlands.

The Kinderdijk-Elshout windmill group near Rotterdam in the Netherlands has a large number of windmills, which are distributed near the Lake and Noord rivers and are well preserved.