Question

What are the merits and demerits of tank irrigation?

Answer 1

Hint:Lakes, earthen check dams, anicuts, and check dams are examples of other water sources for irrigation. Anicuts and check dams are erected in hilly places to conserve rainwater. Similarly, natural and artificial lakes, as well as earthen check dams, are primarily built to meet local water needs.

Complete answer:
An irrigation tank, often known as a tank, is a man-made reservoir of any size. The majority of these may be found in India. Tank irrigation involves building mud banks across tiny streams to create a mini reservoir that collects excess rainwater during the rainy season.

Irrigation is the process of supplying water artificially, primarily for agricultural purposes. A tank is a type of irrigation system in which water is held in man-made reservoirs of various sizes. A tank is frequently built across a hill to collect and store water by utilizing natural mounds and depressions.

Merits	Demerits
It is one of the most cost-effective and widely used irrigation methods.	Tanks, on the other hand, dry out in the summer and aren't very useful.
Maintaining the level of groundwater is beneficial.	The wide stretch of shallow water evaporates a lot of water; therefore it's not available for irrigation.
It is far less expensive than the call water system.	Silting of the tank bed is a major issue that necessitates tank desilting at regular intervals.
Water from the rain can also be stored in tanks.	Tanks are difficult to transport to rocky terrain.
Tanks can be used to collect more water from rainfall.	Other methods of irrigation have been used in several regions, and the dry beds of tanks have been reclaimed for agriculture.

Note: Andhra Pradesh is India's largest state for tank irrigation, accounting for about a third of all tank irrigated land. Tanks irrigate approximately 16% of the state's total irrigated area. The Godavari and its tributaries have a vast number of tanks in their drainage zones. The primary tank irrigation districts are Nellore and Warangal.