Short Essay on the Drainage System of India

When the drainage develops the shape of a tree, the drainage pattern is called dendritic; when they radiate from a hill, it is called Radial; it is Centripetal when a river blow into a depression or lake, in the trellis pattern the primary tribu­taries join from the sides; in the dome pattern, the drain­age combines the elements of annular and radial drain­ages.

The rivers in India have been more or less adjusted to its physical conditions. It is largely influenced by the evolution of three fold physiographic. India has about 113 river basins, the most conspicuous of which are the Ganga and Brahmaputra Basins. Mr. K.L. Rao, an eminent engi­neer has divided the river basins of India into three broad groups on the basis of their catchment areas. River ba­sins with catchment area of 20,000 sq. km or more are classified as major or larger river basins. There are 14 large river basins.

River basins with catchment areas be­tween 20,000 river basins. River basins with catchment areas between 20,000 sq. km. and 2000 sq. kms. Are called medium basins and there are 44 such river basins in the country. Rivers with catchment areas below 2,000 sq. km are termed as rivers. These are by and large, coastal riv­ers. There are 55 minor rivers which originate generally in the coastal mountains.