Coastal Erosion - The NetherlandsLarge parts of the Netherlands are below sea level, protected against floods from the North Sea by a coastal flood defence system consisting of dunes, dams and storm-surge barriers. Over the last decades these flood defences were designed and maintained to be high and strong enough to withstand storm surge levels that may occur with a probability of 1/10,000 per year. The extremely high safety standards of the Dutch flood defence system are unique worldwide.