Dam Barrage And Weirs Pdf

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dam barrage and weirs pdf

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A weir is a small barrier built across a stream or river to raise the water level slightly on the upstream side; essentially a small-scale dam. Weirs allow water to pool behind them, while allowing water to flow steadily over top of the weir. Weirs can be constructed out of several different materials, depending on their age and purpose. Wood, concrete, [3] or a mixture of rocks, gravel, and boulders can all be used to construct a weir. In a weir, the surface over which the water flows is known as the crest.

WHAT IS A WEIR? TYPES OF WEIRS AND FLOW OVER WEIRS

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Both weirs and barrages are obstacles to the watercourse, but the barrage is an expensive structure, while the weir is a relatively cheap structure. Scouring sluices or under sluices. Barrage Weir and barrage lecture 1. Weir is a obstruction in the river course to raise the water level on upstream side. Weir and Barrage - MCQ 1. Choice between a weir and a barrage The choice between a weir and a barrage is largely governed by cost and convenience in working. This allows the structure to adjust and stabilize the elevation of the upstream water for irrigation and other systems.

There is some confusion around the difference between weirs and barrages, more particularly how they fit in the spectrum of dams category as a whole. In this article, you will learn the differences between a weir and barrage. A weir is simply a concrete or masonry structure that is built through an open channel, for instance, a river. In most cases, it is built to control water flow, measure the discharge, prevent flooding and make rivers navigable. It can be built with different materials such as wood, concrete or a mixture of rocks, gravel, and boulders depending on age and purpose. On the other hand, a barrage is a concrete structure that consists of a series of large gates that can be opened or closed to control the amount of water that flows through them.

WHAT IS A WEIR? TYPES OF WEIRS AND FLOW OVER WEIRS

Dam , structure built across a stream, a river, or an estuary to retain water. Dams are built to provide water for human consumption , for irrigating arid and semiarid lands, or for use in industrial processes. They are used to increase the amount of water available for generating hydroelectric power , to reduce peak discharge of floodwater created by large storms or heavy snowmelt, or to increase the depth of water in a river in order to improve navigation and allow barges and ships to travel more easily. Dams can also provide a lake for recreational activities such as swimming, boating, and fishing. Many dams are built for more than one purpose; for example, water in a single reservoir can be used for fishing, to generate hydroelectric power, and to support an irrigation system. Water-control structures of this type are often designated multipurpose dams. Auxiliary works that can help a dam function properly include spillways , movable gates , and valves that control the release of surplus water downstream from the dam.

Dams and Weirs.pdf

The only difference between a weir and a barrage is of gates, that is the flow in barrage is regulated by gates and that in weirs, by its crest height. Barrages are costlier than weirs. Weirs and barrages are constructed mostly in plain areas. The heading up of water is affected by gates put across the river.

 Сьюзан, это Дэвид. Я тебя разбудил. Она улыбнулась и поудобнее устроилась в постели. - Ты мне только что приснился. Приходи поиграть.

И что особенно удачно - эту компанию меньше всего можно было заподозрить в том, что она состоит в сговоре с американским правительством.

The Constructor

Дэвид. Паника заставила Сьюзан действовать. У нее резко запершило в горле, и в поисках выхода она бросилась к двери. Переступив порог, она вовремя успела ухватиться за дверную раму и лишь благодаря этому удержалась на ногах: лестница исчезла, превратившись в искореженный раскаленный металл. Сьюзан в ужасе оглядела шифровалку, превратившуюся в море огня. Расплавленные остатки миллионов кремниевых чипов извергались из ТРАНСТЕКСТА подобно вулканической лаве, густой едкий дым поднимался кверху.

1 Comments

  1. Jeffrey S. 02.02.2021 at 15:52

    Dam , structure built across a stream, a river, or an estuary to retain water.