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The English River Thames is navigable from Cricklade (for very small, shallow boats) or Lechlade (for larger boats) to the sea, and this part of the river falls 71 meters (234 feet). There are 45 locks on the river, each with one or more adjacent weirs .
The broad crested weir at the Thorp grist mill in Thorp, Washington, US. Commonly, weirs are used to prevent flooding, measure water discharge, and help render rivers more navigable by boat. In some locations, the terms dam and weir are synonymous, but normally there is a clear distinction made between the structures. Usually, a dam is designed ...
Such was the popularity of boating that in 1877 the navigation commission stationed a boat and crew in busy days above the weir in case of accidents. [2] The lock was rebuilt in 1906. [ 2 ] On the small lock island is a plaque commemorating Michael J Bulleid whose work for salmon conservancy allows them to scale the river.
[4] [5] The steps produce considerable energy dissipation along the chute [6] and reduce the size of the required downstream energy dissipation basin. [ 7 ] [ 8 ] Research is still active on the topic, with newer developments on embankment dam overflow protection systems, [ 8 ] converging spillways [ 9 ] and small-weir design.
A small weir is located in the upper reaches of the Barnard River, part of the inter-basin water transfer of the Barnard River Scheme, enabling water to be pumped into the Hunter River to meet the cooling needs of Bayswater and Liddell electric power stations.
A fishing weir, fish weir, fishgarth [1] or kiddle [2] is an obstruction placed in tidal waters, or wholly or partially across a river, to direct the passage of, or trap fish. A weir may be used to trap marine fish in the intertidal zone as the tide recedes, fish such as salmon as they attempt to swim upstream to breed in a river, or eels as ...
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A waste weir on a navigable canal is a slatted gate on each canal level or pound, to remove excess water and to drain the canal for repairs or for the winter shutdown. [1] This differs for a dam or reservoir, for which a waste weir is another name for a spillway , i.e. not having the boards to adjust the water height nor the paddles to drain ...