Weir facts for kids
A weir is a barrier built across a river which changes the flow of the river. Depending on the design, some pose problems for fish, as the fish cannot get across the weir.
Gallery
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Many fish have the capability to jump over weirs. This shows a salmon
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this kind of weir is difficult for fish to climb
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Weir designed to make it easy for fish to climb
Images for kids
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A weir on the Humber River near Raymore Park in Toronto, Ontario, Canada
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A broadcrest weir at the Thorp grist mill in Thorp, Washington, USA
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A sluice gate-based weir at Bray Lock on the River Thames, facing downstream, in the background is the smaller secondary 'overspill' weir. Two small boats are also visible held against the overspill weir, having been washed against it during a particularly high discharge as a result of meltwater from the 2018 winter cold wave.
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During periods of high river flow, this nineteenth century weir of porphyry stone on a creek in the Alps would have significantly more water flowing over it.
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The bridge and weir mechanism at Sturminster Newton on the River Stour, Dorset, England, UK
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A manually operated needle dam-type weir near Revin on the River Meuse, France
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A complicated series of broad-crest and V-notch weirs at Dobbs Weir in Hertfordshire, England, UK
See also
In Spanish: Vertedero hidráulico para niños
