Saturday, 4 February 2017

Distribution Works

Distribution Works Points : distribution works, essential requirement of out let, types outlet, non-modular outlet, rigid module, non modular outlets pipe outlet, semi-module or flexible outlets, kennedy’s gauge outlet Outlets An outlet is a small structure which admits water from the distributing channel to a water course of field channel. Thus, an outlet 13 a sort of head regulator for the field channel delivering water to the irrigation fields. The responsibility of maintenance of the distributing channel and the whole canal network lies with Government, while that of the field channels lies with the farmer. The outlet is the connecting medium for the two. Essential requirement of out let Since the efficiency of a canal network mostly depends upon functioning of the out lets and other regulation works, a canal outlet should fulfill the following requirements.

1. The outlet should be strong, with no moving parts liable to be damaged or requiring periodic attention and maintenance.
2, It should be so designed that the farmer cannot temper with its functioning and any interference from him should be easily detectable.
3. Since a large number of out4ets are fixed. on a distributing channel, the moat essential requirement is that it should e cheap.
4. The design should be simple so that It can be constructed or fabricated by local masons or technicians,

Monday, 23 January 2017

Cross Drainage Works – Short Question and Answers

Cross Drainage Works – Short Question and Answers Points : cross drainage works –short question and answers Q.1: Define the term cross drainage works. Ans : Cross drainage work to a structure carrying the discharge of a natural stream across canal intercepting the stream. Q.2: Write down the name of different types of cross drainage works carrying can over the drainage. Ans : Depending upon the relative levels and discharges, cross-drainage works may be of the following types:
In this type of C.D. work, the canal is carried over the natural drain. The advantage of such arrangement is that the canal, running perennially, is above the ground and is open to inspection.

Cross Drainage Works

Cross Drainage Works Points : cross drainage works, types of cross drainage works, cd work carrying canal over the drainage, cd work carrying drainage over the canal, cd work admitting the drainage water into the canal, canal escape Cross drainage work is a structure carrying the discharge of a natural stream across a canal intercepting the stream. When a canal is to be taken to the watershed, it crosses a number of natural streams in the distance between the reservoir to the watershed. Once the canal is taken to the watershed, no cross-drainage works are normally necessary except when the canal leaves the watershed for some distance forming a loop. However, when the canal is aligned as a contour canal, a number of cross-drainage works are necessary.

A cross-drainage work Is generally a very costly item, and should be avoided as far as possible by (i) diverting one stream into another, or (ii) changing the alignment of the canal so that it crosses below the junction of two streams.

Friday, 20 January 2017

Canal Regulation Work - Short Questions and Answers

Canal Regulation Work - Short Questions and Answers Points : canal regulation work - short questions and answers Q.1: Define the regulation work of canals. Ans: Any structure constructed to regulate the discharge, full supply level or velocity in a canal is known as a regulation work. Q.2: Write down the name of various regulation works. Ans: The various regulation works may be categorized as under:
1. Canal fall
2. Head regulator or head sluice.
3. Cross regulator.
4. Canal escape.
5. Canal outlet

Canal Regulation Work

Canal Regulation Work Points : canal regulation work, regulation works of canal, functions of distributary head regulator, meter and non meter falls, necessity and location of falls: Regulation works of canal: Any structure constructed to regulate the discharge, full supply level or velocity in a canal is known as a regulation work. Such a structure is necessary for the efficient working and safety of an irrigation channel. The various ru1ation works may be categorized as under:
1. Canal fall.
2. Head regulator or head sluice.
3. Cross regulator.
4. Canal escape.
5. Canal outlet

Head regulator and cross-regulator regulate the supplies of the off-taking channel and the parent channel respectively. The distributary head regulation is provided at the head of the distributary and controls the supply entering the distributary. It is a necessary link the parent channel and the distributing channel. A distributary head is a regulator, a meter of supply and a silt selective structure. A cross-regulator is provided on the main canal at the d/s of the off-take to head up the water level and to enable the off taking channel to draw the required supply.

Wednesday, 4 January 2017

Silt Controlling Works - Short Questions & Answers

Silt Controlling Works - Short Questions & Answers Points : silt controlling works short questions & answers Q.1: Write down the two method the entry of silt into the canal can be controlled. Ans : The entry of silt into the canal can be controlled by
(1) Providing a divide wall in the river at the canal side so as
(a) to create a trap or pocket.
(b) to create the scouring capacity of under sluices by concentrating the current towards them.
(2) Paving the bottom of the approach channel to reduce disturbance.
(3) Installing a silt excluder.
(4 Making entry of clear top water in the canal by
(a) Providing raised sill in the canal.
(b) lowering sill level of scouring sluices.

Silt Controlling Works

Silt Controlling Works Points : silt controlling works, silt control at headworks, silt excluder, silt extractor or slit ejector Silt Control at Headworks The entry of silt into the canal can be controlled by:

(1) Providing a divide wall in the river at the canal side so as
(a) to create a trap or pocket.
(b) to create the scouring capacity of under sluices by concentrating the current towards them.

(2) Paving the bottom of the approach channel to reduce disturbance.

(3) Installing a silt excluder.

(4) Making entry of clear top water in the canal by
(a) providing raised sill in the canal.
(b) lowering sill level of scouring sluices.

(5) Reducing the velocity of water at the intake by providing wider head regulator.

(6) Avoiding unsteady flow by making the i.mry smooth.

(7) Handling carefully the regulation of weir.
There are two types of special works constructed to control the silt entering into the canal
1. Silt excluder.
2. Silt extractor.