What are the advantages and disadvantages of tank irrigation?

Advantages of tank irrigation are:

1. Tank irrigation is cheaper and is prevalent in Deccan plateau where natural pits and depressions are found.
2. As the water is collected and used in dry season, it uses the water table of the surrounding region.
3. It is difficult to build canals in the Deccan plateau regions.
4. The tank water is used for domestic purposes in villages.
5. In the absence of perennial rivers and canals, tanks provide a source of water during the dry season.

Disadvantages of tank irrigation are:

1. Since tanks are shallow, large amount of water is wasted through evaporation.
2. Tanks are non-perennial and dry up in summer. Considering this and the large area they occupy, they become costly in comparison to wells and tube wells.
3. Tanks use up large areas of land which could be used for agriculture.