Introduction of Canal
Canal plays one of the most important roles in the transportation and global commerce. The canal is widely used for irrigation and drainage of urban Water Supply, hydroelectric power generation, transportation of cargo, and power generation purposes. In this article, you will get to know what Canal Irrigation is and the classification of canals.
What Is Canal?
The irrigation water is conveyed from the reservoir to flow through an open channel of a trapezoidal shape which is known as a canal. The canal is a man-made waterway that allows ships and ships and boats to pass from one place to another place.
Canals are widely used for the transportation of water for irrigation purposes, and for different human uses. In the olden days, the canal is used to connect the waterfalls.
Classification of Canals
The canals are classified into different types on the basis of the factor given as follows.
- Classification of Canals on the Basis of the Usage
- Classification of the Canals on the Basis of Discharge
- Main Canal
- Branch Canal
- Major Distributary Canal
- Minor Distributary Canal
- Watercourses or Field Channels
- Classification of Canals on the Basis of Lining
- Unlined Canals
- Lined Canals
- Classification of Candles on the Basis of Alignment
- Contour Canals
- Watershed Canals
- Side slope Canal
The detailed description of the Classification of canals is given as follows
1. Classification of Canals on the Basis of the Usage
Here, the details knowledge of all canals as per basis of usage are as follows.
Aqueducts are significant watercourse that carries water from a source to the distribution point. There are various types of Aqueducts. There are various types of aqueducts, and the simplest types are mostly small ditches that cut into the earth. They run through the underground tunnels.
The Modern types of aqueducts use the pipeline as their path. These types of canals are used for the conveyance and delivery of water for consumption and other agricultural as well as irrigation purposes.
Waterways are the type of canals that are used for carrying ships, boats, and people from one place to another. The path of waterways is known as the secondary by-product of our country’s extensive historical watermark network. It plays a vital role in Transportation.
This includes the different features like rivers, streams, canals, lakes, reservoirs, and docks. Waterways help to provide a safe operating environment by reflecting on the local environment. Waterways also help to decrease carbon footprints and reduce Road congestion and improve the health of the local community.
2. Classification of the Canals on the Basis of Discharge
Here, the details knowledge of all canals as per basis of discharge are as follows.
2.1. Main Canal
The Canals which have discharged more than ten cumecs are known as the Main Canals. The Main Canal is also known as the Arterial canal. The Main Canal is the superior canal of the drainage system, which helps to collect the water from the drainage canals and conducts it to the water intake.
The Main Canal carries discharge directly from the river. It takes off directly from the upstream side of the weir head works. The main Canal supplies the water to the branch canal. The Main canal cannot be used for direct Irrigation.
The Main canal helps to supply the water from a river, reservoir, or canal to the irrigated land by the flow of gravity.
2.2. Branch Canal
When the main Canal reaches the area where the irrigation is to be done, it divides out into two branches that join the different parts of the area. The Branch canal ends in a Distributary. The branch canals have a discharge that ranges from 5 to 10 cumecs.
Branch Canal also plays the role of the feeder channel for the major and minor distributaries. Branch channels do not carry direct irrigation but provide direct outlets.
2.3. Major Distributary
The canals whose offtake from the Main Canal or the branch canal with the head discharge from 028 to 15 cumecs are known as significant distributaries. The Major distributaries take off water from the branch canals.
The discharge of the major distributary is less than the Branch canal. Major distributary is also known as irrigation channels because of their supply of water to the field directed through outlets.
2.4. Minor Distributary
The canals whose discharge range from 25 to 3 cumecs are known as Minor Distributors. It offtakes from a major distributary. Sometimes Minor Distributary also gets the supply from the Branch Canals.
The discharge in the minor Distributary is less than in the major distributary. They also help to provide the courses through the outlets provided along with them.
2.5. Watercourse or Field Channel
The Discharge in the watercourses is less than 25 cumecs. A filed channel takes off from a significant distributary or minor, and it depends upon the extent to which the irrigation will happen.
From the channels, water enters the field of cultivators. Watercourses field channels may be constructed by the government on behalf of the cultivators only. These are small channels which are known as Field channels, generally have a capacity of fewer than 05 cumecs.
The death of the watercourse or field channels is usually less than 1 km having a command of 10 to 15 hectares.
3. Classification of Canals on the Basis of Lining
Here, the details knowledge of all canals as per basis of lining are as follows.
3.1. Unlined Canals
Unlined Canal consists of beds and banks which are made up of natural soil. The underlined canals are not provided with the lining of impervious material. It reduces the growth of Aquatic weeds, which retards the flow and leads to an increase in the maintenance cost.
Unlined canals can tolerate velocity not more than 0.7 m/s because of erosion. In the case of unlined canals, there may be a danger of the breakage of the bank of the canal, which is caused by the overtopping erosion and animal burrowing.
3.2. Lined Canal
Lining canals are provided with the lining of the impervious materials on their beds and the banks to prevent the seepage of water. The lining of the canals will help in water conservation, prevent seepage of water, and Helps to reduce the maintenance of the canals.
4. Classification of Candles on the Basis of Alignment
Here, the details knowledge of all canals as per basis of alignment are as follows.
4.1. Contour Canal
The control Canal is an artificial canal that is known for being dug and Navigable by following the control line of the land. In this alignment, the canal generally follows a country except for the necessary longitudinal slope. Main Canal is run as a control Canal in the header reach. It can irrigate on one side only, which is the lower side.
In the control Canal, one of its sides is high, so a bank is required only on the other side. There may be a risk of breaching or silting. The control canal need not follow the same contour. To enable the water to flow by gravity, some surface slope should be given.
The drawback of the contour alignment is that it irrigates on one side only. Control panels are most suitable in hilly areas.
4.2. Watershed Canal
The watershed canal aligns with any type of natural water shade or ridgeline. It is also known as the ridge canal. This type of canal usually takes off from the contour canal. It irrigates on both sides. The rich channel is more economical.
4.3. Side Slope Canal
In this alignment, the canal is aligned across the contours. There is not any types of cross drainage works required. These candles have steep bed slopes, and hence linings are necessary to prevent erosion.
What Is an Inundation Canal?
Inundation canals are those which are linked to large rivers. This type of canal system is constructed along the side of the perennial river. These canals are directly taken out from the rivers without constructing any barrages or Dam. This type of canal receives water when the river is high enough and especially in flood.
What Is Perennial Canal?
This canal flow throughout the year. That’s why it is known as perennial canals. The perennial canal is linked to the dams and provides water for the irrigation of a larger area of land.
What Is Canal Irrigation?
An irrigation canal or lateral is constructed to convey water from the source of supply to one or more farms. The purpose of this practice is to deliver water to the farm irrigation system (s).
Advantages of Canal Irrigation
There are many advantages of Canal irrigation which are given below
- Canal irrigation helps in the development of an irrigated area of wasteland.
- Canals can also be used for the purpose of drinking water supply, fishery development, and hydroelectricity.
- The droughts can be avoided with the help of the construction of the canals.
- Canals help to increase the water level.
- Canals provide higher productivity per hectare of land as compared to the conventional method of watering.
- The water requirement of the crop can be fulfilled by the canal with the help of a proper irrigation system.
- Canals are fed by the rainwater from the rivers.
Disadvantages of Canal Irrigation
The disadvantages of Canal irrigation are as follows
- Canal construction required investment and time. That’s why it cannot be used for all irrigation.
- Canals required regular maintenance.
- If the water present in the canal is in a stationary state, then there may be chances of the growth of worms and mosquitoes.
- Due to the shortage of water in the inundation canals, the crops kit was destroyed due to wanting of water.