Active Wildlife Ladder
An unpowered device for providing an aquatic wildlife ladder for giving passage upstream and downstream for animals and fish. An example comprises an upright or substantially vertically mounted housing containing one or more substantially helical surface(s) over which water may flow, providing a continuous water path and preferably easy means of entrance and exit. As water flows through the device it is adapted to turn a central shaft, so that electrical or other useful power may be generated. The present invention is particularly applicable to low-head installations where existing technologies cannot effectively balance investment, hydro-generation, land requirements and ecosystem protection. A particular advantage in such installations in preferred embodiments, is that the device may take the whole flow through a single channel making it easier for wildlife to sense the correct route.
AGGIDIS GEORGE ATHANASIOS [GB]; TIMMIS ROGER JAMES [GB]
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