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Feb 26, 2016 / Haseeb Jamal -

5 Travel Myths You Need to Stop Believing Right Now

Feb 26, 2016 / Haseeb Jamal -

Canal Comes Alive with Lighted Boat Parade.

Underpass Type Wave Suppressor

By far the most effective wave dissipater is the short-tube type of underpass suppressor. The name "short-tube" is used because the structure has many of the characteristics of the short-tube discussed in hydraulic textbooks. This wave suppressor may be added to an existing structure or included in the original construction. In either case it provides a slightly

Spur Dikes Design and Requirements in Geometry

Spur dikes (or groynes) are structures constructed projecting from a bank to protect the bank from erosion. These are widely used for the purpose of river training and serve one or more of the following functions: Training the river along a desired course by attracting, deflecting (or repelling) and holding the flow in a channel. An attracting spur creates deep scour

Sloping Apron Vs Horizontal Apron

There are very few stilling basins with horizontal aprons for its larger dams. It has been the consensus that the hydraulic jump on a horizontal apron is very sensitive to slight changes in tail water depth. The horizontal apron tests demonstrate this to be true for the larger values of the Froude number, but this characteristic can be remedied. If a horizontal apron is designed

Freeboard - Types, Determination & Uses

Freeboard is the vertical distance between the crest of the embankment and the reservoir water surface. Free board can be defined in different terms such as: Normal freeboard is defined as the difference in elevation between the crest of the dam and the normal reservoir water level as fixed by design requirements. Minimum freeboard is defined as the difference in

Distributary Head Regulator - Definition, Working Mechanism

The distributary head regulator is constructed at the upstream end (i.e., the head) of a channel where it takes off from the main canal or a branch canal or a major dis-tributary. The distributary head regulator should

Culverts Types, Design, Installation and Materials

A culvert is an opening through an embankment for the conveyance of water by mean of pipe or an enclosed channel. OR It is a transverse and totally enclosed drain under a road or railway. Pipe culverts are made of smooth steel, corrugated metal, or concrete material. Their primary purpose is to convey water under roads, although a variety of wildlife use them as

Types And Location of Canal Headworks

Any hydraulic structure which supplies water to the off taking canal. Diversion head-work provides an obstruction across a river, so that the water level is raised and water is diverted to the channel at required level. The increase water level helps the flow of water

Weirs - Definition, Types & Locations of Weirs

A solid obstruction put across river to raise its water level and divert water into canal (low head structure) Vertical drop wall or crest wall Upstream, downstream cut off wall at the ends of impervious floor

Components of a Barrage

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. The crest level in the barrage (top of solid obstruction) is kept at

Causes of failure of Weirs & their Remedies

Common causes of failure of weirs include: Excessive and progressive downstream erosion, both from within the stream and through lateral erosion of the banks Erosion of inadequately protected abutments

Site Selection for Barrage

When the angle between the headwork axis and the river axis exceeds 10°, the problem arises of concentration of flow on one side and island formation due to heavy silting within the guide bank on the other side. If the river axis is to the right of headwork axis, the concentration of flow is generally generally on the left side with consequent tendency to form an island

Bligh's Creep Theory for Hydraulic Structures

Bligh's Creep Theory: Design of impervious floor for sub surface flow: It is directly depended on the possibilities of percolation in porous soil on which the floor (apron) is built. Water from upstream percolates and creeps (or travel) slowly through weir base and the subsoil below it. The head lost by the creeping water is proportional to the distance it travels (creep length) along the base of the

Types of Canal Head Regulators

Structure at the head of canal taking off from a reservoir may consist of number of spans separated by piers and operated by gates. Regulators are normally aligned at 90° to the weir. Up to 10" are considered preferable for smooth entry into canal. The functions of canal head regulator are: To admit water into the off taking canal. To regulate the supplies into the canal.

Khosla's Theory of Hydraulic Structures

After studying a lot of dam failure constructed based on Bligh’s theory, Khosla came out with the following: Following are some of the main points from Khosla's Theory. From observation of Siphons designed on Bligh's theory, by actual measurement of pressure, with the help of pipes inserted in the floor of two of the siphons? Does not show any relationship with

How to Design Barrage

The Barrage and the Head Regulators of feeder channels and appurtenant structures will be designed on the basis of standard design criteria established for other barrages and allied structures, already constructed on the Indus River and its tributaries.

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