Why are Peninsular rivers seasonal in nature?

Indian Drainage system is formed by two types of rivers-Himalayan Rivers and Peninsular Rivers. Indian Drainage System has three major systems- Indus River System, Ganga River System and Brahmaputra River System. About 77% of Indian Drainage system is made up of these three major Systems.

Peninsular rivers are seasonal in nature because they are non-perennial rivers. They are dependent on rainfall for their flow of water, so they flow only during the rainy season. They are found in those areas with arid climates where evaporation tends to be greater than precipitation. Some major non-perennial rivers are Narmada, Tapti, Krishna, Kaveri, Godavari, Mahanadi etc. Narmada and Tapti flow through the trough (rift valley which is formed by faulting) in east-west direction whereas Krishna, Kaveri, Godavari, Mahanadi flows in west-east direction and forms delta before entering the Bay of Bengal.