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The filter tube

The core of the DMC is the special filter tube, installed using the HDDW method. HDDW stands for Horizontal Directional Drilled Wells, a technology that has been used successfully for many years to extract underground drinking water.

The filter tube is a high-quality drainage tube with a diameter of around 20 cm. Depending on the soil composition, this is surrounded by a sand package, which acts as an additional filter. The sand package ensures a steady flow of water and prevents lumps of clay being washed towards the filter tube, for example. The dimensions of the filter tube mean that it can always extract more than enough water to ensure the dike’s stability.