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The renovation of the Krammer Lock Complex is much more than just a technical challenge. The lock complex forms a unique transition zone between saltwater and freshwater. For many fish species, it is essential that they be able to move between these two areas. In addition, there are many other (endangered) species of flora and fauna in and around the complex. That is why ecology plays an important role in the renovation, and Ara Adviesburo is steering the project in an ecologically sound direction throughout this large-scale project.
The ecologists now provide advice on virtually all work being carried out at the complex. Whether it involves excavation, laying cables and pipes, or building the new fish passage for the outfall: in each case, they assess the potential impact of the work on the flora and fauna.
The biggest challenge? “Carefully aligning the schedule with nature,” says Daisy Linders, an ecologist at Ara Adviesburo. “For example, construction work must not conflict with the breeding season of the northern vole or with the migration periods of fish. To minimize disruption as much as possible, we drew up an ecological work protocol during the preliminary phase. Sometimes that leads to different choices during implementation, such as driving sheet piles into the ground instead of using vibration.”
Ecology remains a key focus even during construction. “The new fish passage is currently being built on the intermediate island between the lock chambers. This is accompanied by vibrations and noise pollution. We are monitoring the effect on the northern vole population on the central island and whether the noise levels remain within the agreed limits,” says Daisy. “The results are recorded in logbooks and form the basis for further decision-making.”
The complex is also home to various species of gulls, bats, and protected plant species listed on the Red List. That diversity not only makes the work challenging, but, according to Daisy, also makes it special. “In accordance with the Environment Act, the effects of major construction projects on nature must be carefully assessed and managed. This goes far beyond protecting a single plant or animal species. It’s about striking a balance between necessary renovation and the preservation of natural values.”
For Ara Adviesburo—and Daisy in particular—the Krammersluizen project is a wonderful one to be part of. “It’s large, complex, and incredibly interesting from an ecological perspective. Thanks to the expertise and collaboration within our team, we’re always able to strike the right balance between implementation and nature.”
