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.

Sunday, 25 December 2016

Irrigation System in Pakistan - Shot Questions & Answers

Irrigation System in Pakistan - Shot Questions & Answers Points : irrigation system in pakistan - shot questions & answers Q.1: Define the term water requirement of crop. Ans : The functions of soil moisture in plant growth are very important. Water and nutrients are the two most important requirements of the crop. Q.2: Write down any four main function of Irrigation water. Ans : Following are the main functions of irrigation water:
(1) It acts as a solvent for the nutrients1 Water forms the solution of the nutrients and this solution is absorbed by the roots. Thus, water acts as the nutrient carrier,
(2) The irrigation water supplies moisture which is essential for the life of bacteria beneficial to the plant growth.

Thursday, 22 December 2016

Irrigation System in Pakistan

Irrigation System in Pakistan Points : irrigation system in pakistan, crop periods, base period, crop potation, necessity for rotation, duty of water, factors affecting duty, method and systems of irrigation, 2. mode of applying water, method of cultivation, time and frequency of tilling, type of the crop, base period of the crop, climatic conditions of the area, quality of water, method of assessment, canal conditions:character of soil and sub-soil of the canal, factors affecting dutyrelation between duty and delta The functions of soil moisture in plant growth are very important. Water and nutrients are the two most important requirements of the crop. Following are the main functions of irrigation water:

(1) It acts as a solvent for the nutrients. Water forms the solution of the nutrients, and this solution is absorbed by the roots. Thus, water acts as the nutrient carrier.
(2) The irrigation water supplies moisture which is essential for the life of bacteria beneficial to the plant growth.
(3) irrigation water supplies moisture which is essential for the chemical action within the plant leading to Its growth.
(4) Some salts present In soil react to produce nourishing food products only in the presence of water.
(5) Water cools the soil and the atmosphere, and thus make more favorable environment for healthy plant growth. Irrigation water, with controlled supplies, washes out or dilutes
(6 Irrigation water, with controlled supplies, washes out or dilutes stilts the the soil
(7) Ii reduce the hazard of soil piping
(8) It softens the tillage pans

Saturday, 26 November 2016

Canals - Short Questions & Answers

Canals - Short Questions & Answers Points :Canals Short Questions and Answers Q.1: Define the term of canal. Ans : A canal is an artificial channel, generally trapezoidal in shape constructed on the ground to carry water to the fields either from the river or from a tank or Reservoir. Canals can be Classified in following says. Q.2: Write down the classification of canal based on the nature of source of supply. Ans : A canal is said to be permanent when it is fed by a permanent source of supply. The canal is a well made up regular graded channel. It has also permanent masonry works of regulation and distribution of supplies. A permanent canal is also sometimes known as perennial canal when the sources from which canal takes is an ice fed perennial river. Q.3: Write down the difference between permanent and Inundation canal. Ans : Inundation Canals usually draw their supplies from rivers whenever there is a high stage in the river.