Most of the rivers in southern parts are seasonal and dry up in summers making it difficult to supply water to canals throughout the year. The scattered nature of population and agricultural fields in these regions also favours the tank irrigation. Most of the peninsular rivers flow in the east direction because the Peninsula of India is slopped towards the East region. Hence, as the river flow direction generally depends on the land's gradient, most of them are east flowing.

yes of course but the terrain location of the region is also considered important