Dredging

We dredge ditches to ensure the flow and discharge of a certain amount of water. And this is necessary to reduce flooding.

But dredging is also important for water quality. The water bottom always needs oxygen because the decomposition of plant debris is always going on there. If there is very little water above the bottom, oxygen soon disappears from that layer of water and plants and animals can no longer live there. By dredging, we keep the ditch at depth and prevent decay processes and lack of oxygen. 

  • What is dredging?

    Dredging is the removal of a layer of mud, sand or silt (dredge) from the water bottom, of a watercourse (ditch) or a body of water (for example, a lake).

  • Dredging by HHNK

    HHNK is responsible for dredging part of the waters in the management area. This involves about 6,300 kilometers of watercourses.

  • Dredging and pollution

    Before we dredge, we first check the quality of the dredge. We take contaminated dredge to a special landfill.

  • Dredging projects in preparation and execution

    We dredge in rural areas once every 7 years and in urban areas once every 14 years. We dredge large (storage basin) waters once every 30 years.