Question

difference between perinial river and sesonal river

Answer 1

perennial river are Rivers that have water all the months
seasonal river are filled up only at a specific month

Answer 2

perennial rivers one of the which flow throughout the year there are also called evergreen or ever flowing river.
In construct the season reverse include the Godavari river Mahanadi Kaveri except ra these are rivers which are seasonal in nature they are really when water of The Monsoon fills them .