weir-type fish pass

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• Fish counter — Automatic fish counters are automatic devices for measuring the number of fish passing along a particular river in a particular period of time. Usually one particular species is of interest.One important species studied by fish counters are… …   Wikipedia

• Weir — A weir (IPAEng|wɪɚ) (also known as a lowhead dam) is a small overflow type dam commonly used to raise the level of a river or stream. Weirs have traditionally been used to create mill ponds in such places. Water flows over the top of a weir,… …   Wikipedia

• Fishing weir — A fishing weir is an ancient type of fish trap that is traceable back to Roman times in the UK. It is also a technology used by, among others, North American Natives and early settlers to catch fish for trade and to feed their communities.… …   Wikipedia

• Eel ladder — An eel ladder is type of fish ladder designed to help eels swim past barriers, such as dams and weirs or even natural barriers, to reach upriver feeding grounds. (Many eels are catadromous, living in fresh water but spawning at sea.) The basic… …   Wikipedia

• Lock (water transport) — Canal lock and lock keeper s cottage on the Aylesbury Arm of the Grand Union Canal at Marsworth in Hertfordshire, England …   Wikipedia

• Spawn (biology) — The spawn (eggs) of a clownfish. The black spots are the eyes developing. Spawn refers to the eggs and sperm released or deposited, usually into water, by aquatic animals. As a verb, spawn refers to the process of releasing the eggs and sperm,… …   Wikipedia

• Dam — This article is about structures for water impoundment. For other uses, see Dam (disambiguation). Hoover Dam, a concrete arch gravity dam in Black Canyon of the Colorado River. Lake Mead in the background is impounded by the dam …   Wikipedia

• River Poulter — River The ford at Crookford, where a track crosses the Poulter …   Wikipedia

• Drop structure — 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… …   Wikipedia

• Diffusion of technology in Canada — This article outlines the history of the diffusion or spread of technology in Canada. Technologies chosen for treatment here include, in rough order, transportation, communication, energy, materials, industry, public works, public services… …   Wikipedia

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