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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 ...
A drop structure, also known as a grade control, sill, or weir, is a manmade structure, typically small and built on minor streams, or as part of a dam's spillway, to pass water to a lower elevation while controlling the energy and velocity of the water as it passes over.
A sand dam is a reinforced concrete wall (or a similarly robust and impermeable weir) built 1–5 metres high across a seasonal sand river.. When it rains the dam captures soil laden water behind it – the sand in the water sinks to the bottom, whilst the silt remains suspended in the water.
A weir was built on the Humber River (Ontario) to prevent a recurrence of a catastrophic flood. Flood management describes methods used to reduce or prevent the detrimental effects of flood waters. Flooding can be caused by a mix of both natural processes, such as extreme weather upstream, and human changes to waterbodies and runoff.
The Edersee Dam in Hesse, Germany. A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability.
Dams and reservoirs of New South Wales Image Dam name (where appropriate) Reservoir name [1] (where appropriate) Region(s) Waterway(s) impounded [1] Dam type [1] Purpose(s) [1] Reservoir capacity [1] Coordinates [2] ML Gal Gal Avon Dam: Avon Storage Reservoir: Sydney – Macarthur – Illawarra: Avon River: Gravity: Water supply: 214,360 4.715 ...
Among TVA's biggest fans are fishers who can now catch trout downstream from Norris Dam. Here's why 'Healing': Why TVA moved 3,200 tons of rock to restore an island and its aquatic ecosystem
Roller dams are a type of weir, or a dam that is designed to allow water to flow over the top in continuous action. They are used on rivers or other such moving bodies of water where erosion damage is undesirable, yet likely to occur. A short wall, lip, or parabolic channel is constructed on the downstream side of the dam parallel to the dam face.