Types of weirs. (a) Masonry weirs with vertical drop. (b) Rock-fill weirs with sloping aprons. (c) Concrete weirs with sloping glacis. Masonry. Types of Weirs. (a) Masonry weirs with vertical drop. (b) Rock-fill weirs with sloping aprons. (c) Concrete weirs with sloping glacis. Lecture structure on pervious foundation- Khosla’s theory-. Design of concrete sloping glacis weir. ❑Weir or barrage is constructed across a perennial river to raise.
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Trapezoidal Notch falls Required Basic Data: Up stream approach 2.
ENGINEERING DESIGNS-CANAL STRUCTURES GENERAL DESIGN PRINCIPLES
Clear width of the Throat Btnormally down stream bed width. Now-a-days, the weir is constructed with reinforced cement concrete.
TPs Particulars, taken up to hard strata or to a minimum depth of 2m below CBL or ground level which ever deeper with soil classification. The platform below the baffle wall up to the deflector wall is known as the cistern.
Baffle falls or Inglis falls: It is a modern fall, a Straight glacis generally with a slope 2: A typical layout of a canal head-works is shown in kf below. To with stand the impact of the high velocity jet to dissipate the energy. The water from the under-sluice pocket is made to enter the regulator bays, so as to pass the full supply discharge into the canal. The boulders are grouted properly with cement mortar. The shutters are dropped down during flood.
On the upstream side, sesign wall is extended. If you wish to download it, please recommend it to your friends in any social system. This is dummy text. The piers consist of number tiers on which the adjustable gates are slopjng. Barrages are almost invariably constructed now-a-days on all important.
Down stream expansion 5. The downstream sloping apron consists of core walls. It is a low weir constructed at the end of cistern, working on the principle of horizontal impact for energy dissipation. It consists of masonry breast wall which is provided with adjustable crest shutter. To bring the velocity with in qeir permissible velocities, falls or drops are introduced at suitable locations. The crest of the under-under sluice portion of the weir is kept at a oc level 1 1.
The slope of the country, where the canal system has to run will naturally be steeper than the surface slope the canal system that has to come up. The jump is held stable on a horizontal platform by means of baffle wall.
Design Of Hydraulic Structures ~ Civil Engineering Study Materials for GATE IES SSC JE PSUs
The suspended silt goes on depositing in front of the canal head regulator. The discharge for one notch is computed and the number of notches designed by trial and error method considering full supply discharge and half supply discharge Auth with social network: Check for Scour depth Check for exit gradient Check for apron thickness due to uplift.
Thus the invert level of the cistern be kept at 1. It is not meant to be read.
Velocity in a canal is a function of the slope of the canal. To make this website work, we log user data and share it with processors. The hydraulic jump occurs on the glacis causing sufficient hydraulic jump.
When the weight of the weir i. Accordingly, eloping is difficult to figure out when to end it. Rivers are important source weirr fishes. The nature of the fish varies from type to type. Design — Trapezoidal Notch: This movement is essential for their survival.
When there are piers Bt will be reduced as Bt – 0. The maximum height of these gated openings, called head sluices will be equal to the difference of Pond Level and Crest Level of the regulator. We think you have liked this presentation.