Work

Weir construction

In collaboration with contractor Oosterhuis, we are constructing two new weirs at the Matsloot and we are modifying the Doolhof weir.  

• The new weirs will be named Vischlust weir (northern weir) and Rowolder weir (southern weir). Under normal conditions, the weirs are down, allowing water to flow freely. When the additional balancing lake is used, these weirs go up to retain water.  
• The existing Doolhof weir will be raised and fitted with a new gate. The embankments on either side of the weir will also be raised.  

Over the coming weeks, we will be completing the work on the Vischlust weir. The plan is to begin work on the Rowolder weir and the Doolhof weir in the summer of 2026. 

Could you notice the work?

• At the Visschlust weir, the reinforcing steel and concrete slab are now complete. The weir gate has been positioned between the concrete walls. The weir gate is partially submerged. In the coming period, the sheet piling will be removed and the power connection installed.    
• The contractor takes nature into account during the work (breeding season, animal safety, and other measures). Ecologists from the water authority are involved in the work. Read the ecological work protocol here. 

Transport routes during work

Peat will be removed and sand brought in for the two new weirs. Soil will also be needed to raise the flood embankments at the Doolfhof weir. In addition, equipment will be transported to the construction site. 

The map below shows the transport routes. Lorries will be traveling along Hooiweg/Matsloot (the red line) carrying materials for the construction of the weirs. Soil transport will take place on the path along Cosun and the Roderwolder dyke (purple line). During the work on the weirs, public roads will remain open to other traffic. However, traffic may experience some disruption due to the freight traffic.  

You can zoom in on the map with this link.

Earthworks

In collaboration with contractor Van der Meer, we have begun the earthwork. In the coming period, soil will be delivered and stored temporarily at various depots. In some sections, the flood embankments are being raised already. As a result, you will see cranes at work in various locations throughout the area, as well as lorries transporting soil and road plates that are laid on the flood embankments. We are working in accordance with an ecological work protocol.

In May and June, we will be working primarily on the following sections:

• On the flood embankments at Peizer Schipsloot and Peizerdiep

• On the flood embankments at Roderwolde Schipsloot

• At the Bommelier bicycle bridge

• In the north, at the Roderwolder dyke

Work areas may change in the coming weeks. We will post the most up-to-date information here on the website. Do you have a specific question? Please contact us at optimalisatieonlanden@noorderzijlvest.nl.