Question

what is perennial and non perennial rivers​

Answer 1

The rivers which flow or hold water throughout the year are called perennial rivers. eg-Indus, Ganga, Brahmaputra etc. Non perennial rivers are those which depend on rainfall and its flow is restricted for few months only.

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Answer 2

Perennial rivers are those rivers which exhibit a continuous flow of water throughout the year except during extreme drought. ... Non-perennial rivers are those rivers which have no flow for at least a part of the year.