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Hesselberg Hydro

River Bank Works – Overflow Erosion Protection

Climate change is likely to increase demand for flood protection work. For some areas in Europe, greater peak river flows are anticipated with a consequent increased risk of flooding.

Belgium River


The more obvious protection measures frequently introduce additional problems:

  • Larger channels can reduce flood risk but are expensive, and have a considerable adverse environmental impact.
  • If river embankments are overtopped, the embankments themselves are at risk from erosion by the overtopping water OSA being placed.
Belgium River


  • Relatively low value land can be used as temporary flood plains, with overflow waters contained by earth embankments.
  • Durable erosion protection for flood conditions – either OSA on geotextile or the asphalt-reinforced geomat – may also be placed on the ‘dry’ side of the river embankment Revetment during flood conditions.

The pictures show both measures on a Belgian river.