aerated weir

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Whitewater — is formed in a rapid, when a river s gradient drops enough to disturb its laminar flow and create turbulence, i.e. form a bubbly, or aerated and unstable current; the frothy water appears white. The term is also used loosely to refer to less… … 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
Water purification — This article is about large scale, municipal water purification. For portable/emergency water purification, see portable water purification. For industrial water purification, see deionized water. For distilled water, see distilled water. Water… … Wikipedia
Spillway — Chute spillway of Llyn Brianne dam in Wales A spillway is a structure used to provide the controlled release of flows from a dam or levee into a downstream area, typically being the river that was dammed. In the UK they may be known as overflow… … Wikipedia
Outline of canoeing and kayaking — Kayakers view of Lake Coniston, Cumbria The following outline is provided as an overview of canoeing and kayaking: Canoeing is an outdoor activity that involves a special kind of canoe. Open canoes may be poled (punted), sailed, lined and tracked … Wikipedia

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