what does drainage mean what is a drainage basin

Q- What does ‘drainage’ mean? What is a ‘drainage basin’?

Answer- Drainage refers to a complete system of a particular river along with its all major as well as minor tributaries. 

The Drainage basin are formed when some small streams flowing from different directions come together to form the main river, which ultimately drains into a water body. 

The area which is drained by a single or particular river system is known as River basin.

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