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At De Dijkgraaf, a pump has been installed to transport water to the ditch in the middle of the Roosevelt road. The water in the ditch flows to the canal which surrounds the city centre. This inflow of water is important to refresh the canal water and maintain its quality.
Why do we need a pump to fill the ditch in the middle of the Roosevelt road?

Point 6

In 1975 a deep hole was dug, and piezometers were installed here to study the geology of the underground, and monitor & study groundwater flow. Eight piezometers were…