pool-and-weir ladder
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Fish ladder — Fishways, most commonly called fish ladders but also known as fish passes and in Australia also referred to as fish steps, are structures on or around artificial barriers (such as dams and weirs) to facilitate diadromous fishes natural migration … Wikipedia
vertical slot fish passage — this fishway is similar to a pool and weir ladder except that each dam has a narrow slot in it near the channel wall. The channel allows fish to swim upstream without having to leap over the dam wall. This type of … Dictionary of ichthyology
rock-ramp fishway — a structure allowing fish to pass a barrier. Large rocks and timbers are used to build pools and small falls that mimic natural structures. This fishway only works over short distances because of the length of the channel needed for the ladder.… … Dictionary of ichthyology
DeNiel fishway — a chute with lateral baffles that reduce the water s energy and leave a clear passage for fish to swim over the low barrier. There are no resting areas although pools may be provided for this purpose or to reduce flow velocity. See also pool and… … Dictionary of ichthyology
Dunalastair Water — Seen from the high ground to the south Location Perth and Kinross, Scotland Coordinates … Wikipedia
literature — /lit euhr euh cheuhr, choor , li treuh /, n. 1. writings in which expression and form, in connection with ideas of permanent and universal interest, are characteristic or essential features, as poetry, novels, history, biography, and essays. 2.… … Universalium
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
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
Orio Palmer — Orio Joseph Palmer Born Orio Joseph Palmer March 2, 1956 Died September 11, 2001 South Tower, 2 World Trade Center, New York City Cause of death Terrorism Residence Valley Stream, New York … Wikipedia
