Unable to continue a straight line, he had no choice but to withdraw from the race as long-term rival Marcel Hug, of Switzerland, took gold.
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“I have always praised people for their performances they have done – I am never jealous of anyone. It’s an individual sport and I realise that now.”
The equation recommended by the Bureau of Reclamation in their Water Measurement Manual, for use with a fully contracted, 90°, v notch, sharp crested weir with free flow conditions and 0.2 ft < H < 1.25 ft, is:
There are many different types of weirs. A weir can vary from a simple stone structure that is barely noticeable, to elaborate and very large structures that require extensive management and maintenance.
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“I’ve gone from Great Britain now. I wish them well for the future. They’ve done amazing here to win all those gold medals. It’s been amazing to see. They’re a great team.”
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“I have always praised every British athlete who has worn the GB vest, but I sometimes feel like I have been stabbed in the back,” he said.
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For notch angles other than 90°, the Kindsvater-Carter equation, as given below, from the Bureau of Reclamation, Water Measurement Manual, should be used. That equation is:
Dunn commented: “It’s been a huge privilege to work with Dave over the last four years. In my eyes, he is our greatest Paralympian.”
Weir, 37, struggled with the set-up of his chariot all week, misfiring on the track in the 400m, 800m, 1500m and relay.
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Asked to expand on his comments, Weir revealed his frustration had only surfaced in Rio, but declined to elaborate. “I’m not going to say much more,” he said. “I’ll just leave it at that. I’ll talk to Paula [Dunn, Paralympic athletics head coach].
The closing ceremony at the Paralympics will see the curtain fall on a sensational summer of record-breaking achievements – and our best-ever away Games
A v notch weir is simply a 'v notch' in a plate that is placed so that it obstructs an open channel flow, causing the water to flow over the v notch. It is used to meter flow of water in the channel, by measuring the head of water over the v notch crest. The v notch weir is especially good for measuring a low flow rate, because the flow area decreases rapidly as the head over the v notch gets small.
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These weirs are a combination of a V-notch weir and a rectangular weir and are available for insertion in pipes from 6 to 15 inches (150 to 380 mm) - with secondary adapters available for larger pipe sizes. The weirs are intended to measure no more than 35% of the pipe's open channel flow capacity.
V-notch weirs are sized between 22-1/2° and 120°, with 22-1/2°, 30°, 45°, 60°, 90°, and 120° the common size increments - although free-flow discharge equations can be developed from one universal equation for V-notch weirs from 25° to 120° in size.
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Former Paralympian Tanni Grey-Thompson said Weir had talked about feeling “isolated” from the British team and was unhappy with the set-up at the Paralympic Village.
Britain’s greatest wheelchair racer lashed out in frustration after crashing early in the T54 marathon to finish without a medal in any of his five events.
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Stopping short of revealing the reason for his discontent, he suggested that things have not been to his liking behind the scenes in the British Athletics camp in Rio.
A labyrinth weir uses a trapezoidal-shaped weir wall geometry (plan view) to increase the weir length. They are versatile structures and can be modified to fit many applications.
“David’s talked through the week how he’s not happy in Rio,” she told the BBC. “He’s said it’s not to do with training and it’s not to do with his family; he’s just had his fourth child.
A broad-crested weir is a flat-crested structure, with a long crest compared to the flow thickness. When the crest is "broad", the streamlines become parallel to the crest invert and the pressure distribution above the crest is hydrostatic. The hydraulic characteristics of broad-crested weirs were studied during the 19th and 20th centuries. Practical experience showed that the weir overflow is affected by the upstream flow conditions and the weir.
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“He’s very mature, he’s used to doing stuff on his own. As an ex-athlete it’s really hard to hear him say he feels ‘stabbed in the back’.”
David Weir accused an unnamed figure in British Athletics of stabbing him in the back as his disastrous Paralympics ended in pain and acrimony.
Declining to respond directly to Weir’s accusations, Dunn said it had been a “huge privilege” to work with him and paid tribute to the “tremendous service” he has given to the sport since making his Paralympic debut in 1996.
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Asked to name names he would only say it was NOT Paula Dunn, ParalympicGB’s athletics head coach.