write a note on the Drainage systems in india
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In India, water mainly drains in two directions of the main water divide line. 90% of land water drains into Bay of Bengal and the rest drains into Arabian Sea. 1. The Indian Drainage System is divided into 3 categories: (1) Major River Basin with catchment area up to 20000 sq.
In India, water mainly drains in two directions of the main water divide line. 90% of land water drains into Bay of Bengal and the rest drains into Arabian Sea. 1. The Indian Drainage System is divided into 3 categories: (1) Major River Basin with catchment area up to 20000 sq.km. (2) Medium River Basin with catchment area of 2000-20000 sq. km. and above accounts of 8% of the total run off all the rivers and are 45 in India. (3) Minor River Basin with catchment area up to 2000 sq. km. It accounts for 9% of the total run off among all the rivers with 55 basins in India. On the basis of physiographic origin the Indian drainage may be distinguished as the Himalayan drainage and the peninsular drainage. Himalayan drainage system mainly comprises the basin areas of the Indus, the Ganga and the Brahmaputra. These are mostly perennial and youth having gorges, V-shaped valley and depositional features like Deltas. Many of the rivers are older than the Himalayas and cut across it. Whereas Peninsular Rivers is much older and includes numerous rivers. Rivers are matured with almost graded Profiles and mostly superimposed in nature i.e., follow the gradient or fault valley. These are devoid of meanders and have fixed course unlike Himalayan drainage.
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