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A weir / w ɪər / or low-head dam is a barrier across the width of a river that alters the flow characteristics of water and usually results in a change in the height of the river level. Weirs are also used to control the flow of water for outlets of lakes, ponds, and reservoirs.
The weir at Mapledurham Lock Mapledurham Watermill. From ancient times there were many obstructions across the Thames, for fish-pounds and millers' weirs. They are referred to by Asserius Menevensis in the ninth century and Magna Carta (1215) states that "weirs, for the time to come, shall be demolished in the Thames and Medway, except on the ...
The development features 2½ miles of paved walking and biking trails, numerous holding ponds, rain gardens, fountains, weirs, waterfalls and other infrastructure that comprise the "treatment ...
There is a proposal to build a weir above the waterfall and pipe some of the water away from a hydrolectric scheme. Those backing the scheme state that it will generate enough electricity to power 700 homes. Opponents say that up to 70% of the water will be diverted away from the falls, which will change the overall look of the waterfall. [10]
The distinctively shaped weir, which is 460 feet (140 m) long, helps create a pool of water that can enter the Llangollen Canal (via an adjacent valve house and flow meter). The canal west of Pontcysyllte Aqueduct and the construction of the weir were authorised by an Act of Parliament obtained in 1804 by the Ellesmere Canal Company.
A waterfall is generally defined as a point in a river where water flows over a steep drop that is close to or directly vertical. In 2000 Mabin specified that "The horizontal distance between the positions of the lip and plunge pool should be no more than c 25% of the waterfall height."