Together with Rijkswaterstaat, we are working on a solution for the leaking aqueduct near Akkrum. Four holes in the water-retaining foil of the Leppa aqueduct's trough structure cause approximately 3,300 litres of groundwater to leak daily into the submerged section. Two of these holes are located up to 10 metres below ground level. As this depth is difficult to access, special test setups and targeted injections are being used to investigate how the aqueduct can be made fully watertight and safe again.
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Injection Tests for a Leak-Free Aqueduct in Friesland
To simulate the situation at the aqueduct as realistically as possible, an extensive test setup has been built on the Panhuyspoel site in Earnewâld. This setup consists of sand and pipes that are precisely matched in terms of structure, properties, and even the type of leak to the actual construction of the aqueduct near Akkrum.
In this test setup, we inject polymer and acrylate resins into the pipe from the outside. The materials expand and form a strong, durable seal in the sand around the pipe. This creates a solution that is resistant to water pressure and prevents new leaks from occurring.
Not every test succeeds immediately. On the contrary, every test provides important insights. Furthermore, by continuously testing, evaluating, and improving, we are getting closer to the optimal solution step by step. This ensures that the aqueduct will remain safe and watertight for many years to come, allowing traffic and the surrounding area to rely on a stable and durable structure.
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