Runsloot pilot project
An important part of the plan is a pilot project in the Runsloot. We are trying out natural measures at three different locations. These include narrowing the stream and reducing mowing.
- When choosing measures, we pay close attention to the environment. The measures must not cause problems for farmers, residents, adjacent plots, and homes.
- With this trial, we want to learn about the effects on the water level in the Runsloot, the groundwater levels of the adjacent plots,the flow, the fish population, and the plant growth. That is why we are installing measuring points at various locations. This will allow us to closely monitor any changes.
- We are taking small measures in and around the stream. This is expected to create more space for nature. It will also increase the variation in flow and soil. We expect this to be beneficial for water quality and biodiversity.
The pilot project will start in early 2026.
Three trial locations in Runsloot
There are three pilot projects. Each project consists of three test subjects. A different small measure is tested in each subject:
- In one section, the stream is narrowed using a row of posts.
- In a second section, only part of the stream is mowed (Customized Maintenance).
- Nothing is done in the third box; this is the zero situation so that the different variants can be properly compared.
Below you can see the trial locations.
Explanation of test measures
Stream narrowing using posts
In section 1, the stream bed is narrowed using a row of posts. There will be open and closed rows of posts. This will allow us to test what works best. By placing these halfway along the existing watercourse, for example, the profile of the stream bed changes. The water is no longer discharged in a straight line, but meanders, creating more variation in the flow and the bed.
There are several openings in the rows of posts. Fish can swim through these. A quiet zone is created behind the posts. Plants are allowed to grow here naturally. This part will not be mowed for the time being. Only the other side of the stream will be maintained. If nothing happens for years, a permanent bank may form. That is not the intention. After a year, we will assess whether maintenance is needed or whether it can remain as it is.
Stream mowing (Customized Maintenance)
In section 2, we will try to achieve the same effect as in section 1, but without making any changes to the stream. Only one side of the stream will be mowed. The plants on the bank will remain standing. This is called passive development.
Because only one side is mowed, the other side becomes overgrown with riparian plants. This causes the stream to narrow. Maintenance is carried out in the same way as in section 1: only one side is mowed. After a year, we will assess whether this is working well or whether adjustments need to be made. This prevents the stream from becoming completely overgrown or trees from growing.
Why do we use test subjects?
When devising measures, it is important that they do not have any negative effects on water safety, homes, land use, or the groundwater level of surrounding agricultural land. With this pilot, we are testing in practice what the impact is on water levels, currents, fish stocks, and plant growth. That is why we are installing measuring points and working with different test areas, including a control area without any interventions. This allows us to gather valuable information for the final measures.
What will happen with the findings?
The trial period will last approximately one year. If favorable effects are observed during the pilot period, we may also implement these measures in other sections of the Runsloot and Stroetenloop.