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单词 shutter weir
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shutter weir
shutter weir n. a type of movable weir consisting of one or more leaves pivoted about a horizontal axis at or towards the bottom and held nearly vertical until released.
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the world > the earth > water > lake > pool > [noun] > artificially confined water > contrivance for impounding water > weir > types of
mill weirlOE
foot weirc1474
kiddle1477
rowte weir1584
catchwater drain1744
carry1753
dam-head1762
overfall1764
gauge-weir1791
shutter weir1880
1880 Engineering 30 Jan. 102/1 The needle and shutter weirs had been the most extensively adopted, and were the best types of movable weirs... The shutter weir was the most suitable for high weirs across rapid rivers, and where the navigation was conducted by flushing.
1886 Encycl. Brit. XX. 574/2 The earliest form of shutter weir consisted of a gate, or shutter, turning on a horizontal axis at the bottom, supported by a prop when raised against the stream, and falling flat on the apron of the weir when the prop was withdrawn.
1903 Nature 20 Aug. 363/1 The Chanoine shutter weir is composed of a series of shutters supported centrally on a trestle, and turning on a horizontal axis.
1928 F. Johnstone-Taylor River Engin. iii. 69 The shutter weir, as a form of barrage, is not a new introduction, having been used..principally in Central Europe, for a number of years.
extracted from shuttern.
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