Flood defence system with concrete retaining walls
Construction consortium Van Heteren, Jansen Venneboer and the Belgian company Aggeres Flood Solutions constructed the flood barrier in the historic centre of Spakenburg. Bosch Beton needed to develop a unique mould to match the chosen structure and the specific shape of the float. We produced an incredibly special U wall to safeguard the structure’s rigidity. The other quay walls were also made from Bosch Beton retaining walls. The retaining wall also provided the basis for the wall’s brickwork finish.
Van Heteren is well aware of our engineering and customisation specialisations and qualities as we already had a good relationship with this road and hydraulic engineering company. That’s why they decided to ask Bosch Beton to help with this complex flood defence system project.
A flood defence system can be needed in north-westerly force 11 storms that cause the water in the Eemmeer to surge into Spakenburg and run over the Oude Haven and the Nieuwe Haven quays. Now, the innovative and self-closing flood barrier activates automatically when water levels are high and, as the flood defence system is only visible at high water, the fishing village’s historic look has been retained. The floating flood defence system of 330 metres long was constructed in 2017.
The water helps
This innovative solution uses the help of the water itself. The sunken basin contains a floating retaining wall that rests on a 30-cm-wide float. There are openings on the water side. If the water reaches over 60 cm +NAP the gates open and the water can fill the basin. The retaining wall then floats upwards to protect the hinterland from flooding. Once the water level falls, the retaining wall falls with it.
>> View an explanation of the self-closing flood defence system here.
Annual test day
Waterschap Vallei en Veluwe Water tests the self-closing flood defence system in Spakenburg every year on the third Wednesday in September. The test attracts a lot of attention from passers-by, residents and other national and international interested parties. During the test, water board employees check that the system is working properly, the walls come straight up and there are no cracks or other defects, etc.
If you’d like to know more about this ingenious flood defence system read the article in De Ingenieur – Flexibele waterkering in Spakenburg
PROJECT IN THE PICTURE
Retaining walls used again for Medtronic’s expansion in Heerlen
We supplied L retaining walls with heel in various sizes to serve as terrain fencing and to absorb height difference for the expansion of Medtronic in Heerlen.
Robust terrain fencing at Roermond distribution centre
A hundred Bosch Beton L retaining walls were used at a distribution centre at Roerstreek Noord Business Park in Roermond.
Pond and platform of retaining walls at Apeldoorn car showroom
The forecourt around Van Mossel car showroom in Apeldoorn underwent a complete makeover. We supplied retaining walls to construct a pond and a display platform.
Sustainable salt storage for RWS road maintenance depots
The Rijkswaterstaat road maintenance depots in ‘s Hertogenbosch, Zevenaar and Staphorst were in need of renovation. We supplied various L and T retaining walls for the salt storage.
Innovative solution under water for RWZI Almelo
We supplied various TWA and L retaining walls for the upgrade of De Sumpel wastewater treatment plant (RWZI) in Almelo.
Radius retaining walls for viewpoint in Rhenen
The curve in the viewpoint across the Nederrijn at Rhenen was constructed using radius retaining walls. A unique project in the stunning Dutch landscape.
Retaining walls form a noise barrier along the Nijmegen-Den Bosch railway line
To reduce noise nuisance, a 300-metre-long noise barrier was constructed from retaining walls along the Nijmegen-Den Bosch railway line.
Platforms at Holten station widened using retaining walls
For the upgrade at Holten station, the platforms were widened using retaining walls, increasing the station’s capacity.
Arnhem Berg railway sidings safer because of retaining walls
We placed retaining walls over a 200-metre section along the Arnhem Berg railway siding. The walls serve as an earth retention system around a water access point along the railway line.
Boathouse from retaining walls at B&B in Heerenveen
We created a boathouse from retaining walls at B&B ‘Uitgerust voor Zaken’ in Heerenveen, Friesland.