How much of the Netherlands is affected by the problem regulated by the Hoogheemraadschap van Rijnland?
Flood control in the Netherlands Flood control is an important issue for the Netherlands, as about two thirds of its area is vulnerable to flooding, while the country is among the most densely populated on Earth. Natural sand dunes and constructed dikes, dams, and floodgates provide defense against storm surges from the sea. River dikes prevent flooding from water flowing into the country by the major rivers Rhine and Meuse, while a complicated system of drainage ditches, canals, and pumping stations (historically: windmills) keep the low-lying parts dry for habitation and agriculture. Water control boards are the independent local government bodies responsible for maintaining this system.
Nieuw-Vennep Nieuw-Vennep is a town in the Dutch province of North Holland. It is a part of the municipality of Haarlemmermeer, and lies about 10 km southwest of Amsterdam Airport Schiphol. It has about 31,300 inhabitants, half of which live in the newly built district of Getsewoud. The built-up area of the town was 3.71 km, and contained 7,513 residences. The wider statistical area of Nieuw-Vennep has a population of around 40,000. In 2001, Nieuw-Vennep had 17,886 inhabitants, which later doubled due to the development of Getsewoud.