noun
definition
An adjustable dam placed across a river to regulate the flow of water downstream.
definition
A fence placed across a river to catch fish.
Examples of weir in a Sentence
The weir across the Jumna was the first attempted in Upper India upon a foundation of fine sand; it is about 800 yds.
A peculiar and cheaper form of drum weir has been constructed across ten bays each 75 ft.
Upstream of the tidal weir, river flow has the greatest impact on flooding.
Firstly I had to build a weir across half of the river's width.
Anthony weir Quiet rain.
First posts A line of 10 posts cutting across a channel in Somerset may be part of an ancient salt marsh fish weir.
The Roman road is now shown to have crossed the river 200 meters downstream from the navigation weir.
The Savick Brook is flowing in from the right over a stone weir.
The frames hang vertically from the bottom of the overhead bridge, and rest against a sill at the bottom when the weir is in operation, the openings between the frames being closed below the water-level by rolling-up curtains or sliding panels, which are lowered or raised by a travelling winch carried by a small foot-bridge formed by hinged brackets at the p ack of the frames, and situated a little above the highest floodlevel.
The weir is raised by admitting water from the upper pool into a wedge-shaped space left below the sector when it is lowered in the drum, which by its pressure lifts the sector out of the drum, forming a barrier, 7 ft.
At the time of his death Robert Louis Stevenson was working on his unfinished masterpiece, Weir of Hermiston.
Large " icebergs " of floating foam were wafting down from Cromwell weir.
Firstly I had to build a weir across half of the river 's width.
Finished in a high luster white gloss, complete with a traditionally styled weir waste overflow.
Bob Weir Professional - This 1978 model was made specially for Grateful Dead guitarist Bob Weir.
During the eighth season, Jack O'Neill assumed the head of Stargate command after Elizabeth Weir joined the Atlantis mission.
One episode dealt with the discovery of a very old woman who turned out to be an Elizabth Weir.
The elderly Weir lost her expeditionary force when the city flooded.
This alternate Weir, Sheppard and Zelinka discovered a puddle jumper that had a time traveling capability.
Weir explained to the Ancient scientist Janus what happened and the two conspired against the Ancient Council's wishes to protect the city and save the Expedition when it arrived thousands of years in the future.
This alternate Weir remained in stasis, waking every few hundred years to cycle the ZPMs, conserving power so that the shields would hold until it rose to the surface.
During the third season, the crew mourned the loss of Dr. Beckett and later Dr. Elizabeth Weir.
After season three, Elizabeth Weir was written out to make room for Amanda Tapping's Colonel Samantha Carter.
A diplomat with extensive experience, Weir was appointed by the President to take control of Stargate Command, a nod to international pressure against U.S. military control.
When the address to the Ancient's abandoned city was discovered, Weir was appointed the head of a multi-national expeditionary force.
Weir led the Atlantis expedition capably until a run-in with Human Form replicators cost her, her life.
Timeline references allow fans to know when the stories take place and can feature familiar faces like Carson, Weir, Todd or Michael as well as Shepherd, McKay, Teyla and Ronon.
The Wrecker, an adventurous tale of American life, which mainly belonged to an earlier time, was written in collaboration with Mr Lloyd Osbourne and finally published in 1892; and towards the close of that very eventful and busy year he began The Justice Clerk, afterwards Weir of Hermiston.
He was dictating Weir of Hermiston, apparently in his usual health, on the day he died.
The normal natural flow in ordinary summer weather is about 350,000,000 gallons a day, and of this, after the companies have taken 130,000,000, only 220,000,000 gallons are left to pass over Teddington Weir.
Assiut stands near the west bank of the Nile across which, just below the town, is a barrage, completed in 1902, consisting of an open weir, 2733 ft.
Banks thereupon retreated, and, high water in the river having come to an end, the fleet was in the gravest danger of being cut off, until Colonel Bailey suggested, and rapidly carried out, the construction of a dam and weir over which the ships ran down to the lower waters.
A weir is thrown across the Betwa about 15 m.
This serious defect of solid weirs, where the riparian lands are liable to be injured by inundations, can be slightly mitigated by keeping down the crest of the weir somewhat below the required level, and then raising the water-level at the low stage of the river by placing a row of planks along the top of the weir.
The discharge of a river at a weir can be regulated as required and considerably increased in flood-time by introducing a series of openings in the centre of a solid weir, with sluice-gates or panels which slide in grooves at the sides of upright frames or masonry piers erected at convenient intervals apart, FIG.
This weir retains the river above it at half-tide level, in order to cover the mud-banks which had been bared at low tide between Richmond and Teddington by the lowering of the low-water level, owing to the removal of various obstructions in the river below.
The weir is raised ¦ '.'
The ordinary form of frame weir consists of a series of iron frames placed across a river end on to the current, between 3 and 4 ft.
The barrier was originally formed of a number of long square wooden spars which could be readily handled by one man, being inclined slightly - from the vertical and placed close together for shutting the weir; but panels of wood or sheetiron closing the space between adjacent frames and sliding in grooves at the sides, and rolling-up curtains ?
The needle weir has, however, attained its greatest development in the United States across the Big Sandy river at Louisa, where, instead of needles 3 to 4 in.
The weir is opened by joining the needles of each bay by a chain passed through the eyes at the top and a line of wire through the central rings, so that when released at the top by the tilting of the escape bar by the derrick, they float down as a raft, and are caught by a man in a boat, or, when the cur rent is strong, they are 'mopes ?o drawn to the bank by a rope attached to them previously to their release.
The trestles of this weir are, as usual, hinged to the apron, so that in flood-time they can be completely lowered into a recess across the apron by means of chains actuated by a winch, leaving the channel perfectly open for the discharge of floods and for the passage of vessels when the lock is submerged.
Whereas, however, ordinary frames placed nearer together than their height overlap one another when lowered on to the apron, the trestles of the Louisa weir lie clear of each other quite flat on the apron.
The weir is opened by removing the sliding panels or rolling Scale 'kW.
This system, which has been employed for the lowest weir on the Moldau, and for a weir at the upper end of the Danube canal near Vienna to shut out floods and floating ice, as well as on the Seine, possesses the merits of raising all the movable parts of the weir out of water in flood-time, and rendering the working of the weir very safe and easy.
This weir is raised by admitting water under pressure beneath the gates through culverts in connexion with the upper pool; and is lowered by unfastening the raised gates and letting the water under them escape into the lower pool.
The weir is raised again by pulling up the shutters to a horizontal position by their bottom chains from a special boat, or from a foot-bridge on movable frames, together with their trestles and the props which are replaced in their shoes.
The discharge at the weir whilst it is raised is effected either by partially tipping some of the shutters by chains from a foot-bridge, or by opening butterfly valves resembling small shutters in the upper panels of the shutters.
The addition of a foot-bridge greatly facilitates the raising and lowering of these shutter weirs, and also aids the regulation of the discharge; but it renders this form of weir much more costly than the ordinary frame weir, and where large quantities of drift come down with sudden floods, the frames of the bridge are liable to be carried away, and therefore boats must be relied on for working the weir.
The drum weirs erected across shallow, regulating passes on the river Marne in1857-1867comprise a series of upper and under wrought-iron paddles, which can make a quarter of a revolution round a central axis laid along the sill of the weir.