On 20 July 2018 at 23:23, Richard <ricoz....@gmail.com> wrote: > > indeed and as they are getting more widespread more variations can be > expected. >
One was mentioned near here last week that they have installed a full on lock for fish to bypass a weir. They swim into a chamber through the bottom gate which automatically closes after x minutes, fills with water then the top gate opens to allow the fish to swim out & proceed up river.
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