Targets and results of the Houtribdijk
Rijkswaterstaat reinforces the Houtribdijk between Enkhuizen and Lelystad so that it once again meets the safety norm laid down in the Water Act. The Houtribdijk serves as a massive breakwater between the IJsselmeer and the Markermeer during storms. This makes the Houtribdijk vitally important for flood risk management in all provinces in the IJsselmeer region.
A part of the Houtribdijk is reinforced with quarry stones. Another part of the levee is reinforced using wide, sandy banks. We also develop Trintelzand, a new nature reserve. This way, we provide opportunities for nature and contribute to improving the water quality in the Markermeer. Finally, we also create a new beach for windsurfers and kite surfers near Lelystad.
Reinforcement using sandy banks
The Houtribdijk features wide, sandy banks on both sides between Enkhuizen and Trintelhaven. The sandy banks are covered with vegetation and gradually taper off (some 70 m above the water and 70 m below the water). In total, the levee is raised with about 10,000,000 m3 of sand. That is as much as normally applied to the entire Dutch coast in a year. The sandy banks absorb the waves from the Markermeer and IJsselmeer, protecting the levee from the power of the water. New species of plants and animals will find a habitat here, too.
Reinforcement using quarry stones
Between Trintelhaven and Lelystad, we will reinforce the levee with 1,200,000 tonnes of new quarry stones (natural stones with an irregular shape) and poured asphalt.
New nature reserve Trintelzand
One of the largest 'extra' interventions is the creation of Trintelzand, a 532-hectare nature reserve featuring sand dunes, mud flats and reed banks. It will be suitable for mussels, snails and aquatic insects and act as a nursery for fish. The aquatic animals will provide food for bird species such as the tufted duck, common tern and great crested grebe. Upon completion of the reinforcement in 2020, the result will be an area full of life. Just like the sandy banks, it will contribute to improving the water quality and strengthening the ecosystem in the Markermeer.
Water sports beach
The Houtribdijk will include a water sports beach for kite surfers and windsurfers near Lelystad.