Importance of irrigation:- Irrigation means the artificial way of watering the crops. Irrigation is very important for Pakistan.We have little rainfall therefore we get the help of irrigation in preparing our crops. The progress of our country depends upon the means of irrigation and their progress. All parts except northern mountains depends upon irrigation. 67% of our land is irrigated due to little rainfall. The most important means of our irrigation is our system of canals. Our canals irrigate 70% of our lands while 14% is left for tube-wells, Persian wheels Karez and ponds.
Explanation:- Irrigation is the man-made supply of water to the land to encourage vegetation. It is a substitute for inadequate or erratic rainfall and is extremely essential for arid regions where there are no rivers and also in humid regions to improve crop output. In Pakistan, 75% of the agricultural land is under irrigation. Three major water sources in Pakistan are rain water, ground water and rivers.
Irrigation system is not something new. Since olden days, people had devised various methods to water their fields. Some traditional methods of irrigation are Persian Wheel, Charsa and Shaduf. Karez is another traditional irrigation system practiced in Baluchistan only. Karez is a horizontal canal located mainly on the foot hills and it brings the under ground water to the surface. Modern advancements in the irrigation system are the perennial canals and tube wells.
Pakistan is basically a dry country with the River Indus and its tributaries being the main source of water supply. Dams both large and small and barrages have been built on the Indus and its tributaries. Large dams such as Tarbela Dam and Mangla Dam are multipurpose plans which not only store water, irrigate lands but also generate hydro electricity.