Canal is an artificial waterway constructed for purposes of irrigation drainage or navigation or in connection with a hydroelectricity dam..
Canal is the thing which brings river water close to the find where it is required to be.
The canals come out of rivers dams and barrages.
Types of canals:
There are three main important tpyes of canals in Pakistan.
1 perennial canals.
2 non perennial canals.
3 inundation canals.
Perennial canals:
These canals supply water throughout the year. Perennial canals are the canals that are used to supply water to the field and these are taken either from dams dams or barrages. Important perennial canals of Punjab are upper bari doab lower bari doab sidhanai canals upper and lower Chenab upper Jhelum canals originating from Trimmu headworks and canals originating from river Sutlej at ferozpur Islam suleimanki and panjnad headworks.
Non perennial canals:
These canals run during the summer and the rainy season. Sidhnai canals from the Ravi haveli canals from the Chenab and some of the Sutlej canal falls in this category.
Inundation canals:
These canals run only during the rainy season when water level in river rises. The quantity of the water they supply is uncertain. These canals like other canals are taken from the rivers but the difference is that they get weterbwhen there is a rise in the water level due to flood. Many old canals from the Indus and the Chenab fall in this category.......
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