The correct answer is sinking wells Explanation & Key Takeaways: Different Irrigation System • Canals, ponds, and tanks often dry by summer and remain dry till the arrival of the monsoon rain. • In between groundwater becomes the source of irrigation for farmers in such dry regions. • But access to groundwater serves as one of the major obstacles faced by smallholder farmers in many regions that affect agricultural activity. • This is why sinking wells or irrigation wells are very much beneficial for agricultural purposes. Related Concepts: Irrigation system • Irrigation is the controlled application of water through man-made systems to meet the water requirements of agriculture. Irrigation is an artificial application of water to crops or plants, especially when an agricultural field does not get enough water through rains. • Having perhaps the largest irrigated area in the world, India faces acute water scarcity. • Thus the process of supplying water to crops by artificial means such as canals, wells, tube-wee, tanks and etc from the sources of water such as rivers, tanks, ponds, or underground water is called irrigation. Need for Irrigation • Enhance productivity • Tap the Productive potential of soil • Reduce dependence upon Monsoon and rainfed agriculture • Enhance Production by having multiple crops within a year.