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Insufficient fish migration

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Insufficient fish migration

The free migration of fish is obstructed.

Small fish passages are often located in areas were waterways are completely dry in the summer. The passages are closed during this period because area managers can not open or close them every few days. Automatic opening and closing systems do exist but are very expensive compared to the small passage.


Fully automatic fish weir

The fully automatic fish weir is a new, automatic system which can open or close a weir in a water level range of 5 cm (by using another float). The system is powered by solar energy and thus not depending on an external power source.


  • The system is fully automatic and not depending on an area manager.
  • Own energy supply.
  • Little maintenance need.
  • Cheap.


  1. Topic Water quantity
  2. Development state 10: Proven in operational situation
  3. Setting type Rural area
  4. Water type Surface water
  5. Project period 0-3 months

Submitted innovation Award

Water Innovation Award