River basin management

9 important questions on River basin management

River flood measures: Strengthening dykes

Dikes are strengthened in areas in which creating more room for the river is not an option.

River flood measures: Water storage

A lake can provide temporary water storage with exceptional conditions (closed storm surge barrier and high river discharges)

River flood measures: Lowering groynes


•Groynes stabilise the location of the river and ensure that the river remains at the correct depth.
•However, at high water levels groynes can form an obstruction to the flow of water in the river.
•Lowering groynes increases the flow rate of the water in the river.
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River flood measures: Removing obstacles

Removing or modifying obstacles in the river bed, where possible, increases the flow rate of the water in the river.

River flood measure: High water channel

A diked area that branches off from the main river to discharge some of the water via a separate route.

River flood measure: Lowering floodplain


•Excavating an area of the floodplain
•Sedimentation has gradually raised the level of the floodplains over the past few centuries

River flood measures: Depoldering


•The dike on the river side of a polder is relocated land inwards.
•The polder is depoldered and water can flood into the area at high water levels.

River flood measures: Dyke relocation


•Relocating a dike land inwards increases the width of the floodplains and provides more room for the river.
•Exposing land that once was protected

What are 4 measures that could be taken for draughts?


•Reduce water use agriculture, industries and households
- Information / communication
-  Legal restrictions
•Active early-warning systems
•Transport:
  -narrow summer bed
  -Restrictions concerning loading capacity
•Sluices and dams
  -To retain water upstream
  -To steer water towards certain rivers

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