Chapter 3: INDIA – DRAINAGE SYSTEM

Jun 28th, 2015
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By the term ‘drainage’, we mean the river system of an area. Small streams from different directions join to form a river. The river ultimately merges into a larger water body – a lake, a sea or an ocean. The area that a single river drains is the drainage basin of that river.

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1Chapter 3: INDIA DRAINAGE SYSTEMWhat is drainage?By the term drainage, we mean the riversystem of an area. Small streams fromdifferent directions join to form a river. Theriver ultimately merges into a larger waterbody a lake, a sea or an ocean. The areathat a single river drains is the drainagebasin of that river.Sometimes two drainage basins are separatedby upland or a mountain/hill. Such upland ormountain is called water divide.Important: Worlds largest drainage basin is of theRiver Nile in Egypt in Africa. River Ganga has its largest drainagebasin in India.Drainage system of a place is largelydetermined by its relief features.There are two types of Drainage System inIndia;(1) Antecedent Drainage System(2) Super imposed Drainage System(1) Antecedent drainage system:Those rivers which have originated priorto the development of land mass, e.g.Northern Himalayan rivers were presentbefore the upliftment of Himalaya likeIndo-Brahma river, Indus, Sutlej, etc.(2) Super imposed Drainage systems:These rivers develop after thedevelopment of land masses e.g. Riversof peninsular India were developed onBATHINDA: S.R. House, St. 6/6. 100 Ft. RoadPH: 9216430007the Archean basementGondwana land.rocksofDrainage Pattern:Pattern means Orientation or alignment ofrivers at a particular place e.g. Radialdrainage pattern, Herring bone pattern etc.India as a whole exhibit several kind ofdrainage pattern in different region

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