Question

what is drainage , estuaries, deltas, and seasonal and prennial rivers

Answer 1

The velocity of water in the rivers and the load carrying capacity of the streams is low due to low gradient. Most of the major rivers of the peninsula such as the Mahanadi, the Godavari, the Krishna and the Cauvery flow eastwards and drain into the Bay of Bengal. These rivers make deltas at their mouths..

Answer 2

See the photo for your answer.
And one topic is here

Seasonal rivers are rivers which are seasonal in nature i.e they are lively when water of the monsoon fills them. They are mostly found in the southern part of India.