Waterproblems find their solutions
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.
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