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Drainage System

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Question
CBSEENGE11011456
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What is a drainage basin?

Solution

An area drained by a river and its tributaries is called a drainage basin.

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Question
CBSEENGE11011457
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These are : (i) Betul (M.P.), (ii) Nasik (Maharashtra), (iii) Chhattisgarh, (iv) Mahabaleshwar and Brahmagiri range of Western Ghats.

Solution

Question
CBSEENGE11011458
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What are the important drainage patterns? Describe.

Solution

Important Drainage Patterns:
(i) The drainage pattern resembling the branches of a tree is known as “dendritic” the examples of which are the rivers of northern plain.
(ii) When the rivers originate from a hill and flow in all directions, the drainage pattern is known as ‘radial’. The rivers originating from the Amarkantak range present a good example of it.
(iii) When the primary tributaries of rivers flow parallel to each other and secondary tributaries join them at right angles, the pattern is known as ‘trellis’.
(iv) When the rivers discharge their waters from all directions in a lake or depression, the pattern is know as ‘centripetal’.

Question
CBSEENGE11011459
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Explain the evolution of peninsular drainage System.

Solution

Three major geological events in the distant past have shaped the present drainage systems of Peninsular India:
(i)Subsidence of the western flank of the Peninsula leading to its submergence below the sea during the early tertiary period. Generally, it has disturbed the symmetrical plan of the river on either side of the original watershed.
(ii)Upheaval of the Himalayas when the northern flank of the Peninsular block was subjected to subsidence and the consequent trough faulting. The Narmada and The Tapi flow in trough faults and fill the original cracks with their detritus materials. Hence, there is a lack of alluvial and deltaic deposits in these rivers.
(iii)Slight tilting of the Peninsular block from northwest to the southeastern direction gave orientation to the entire drainage system towards the Bay of Bengal during the same period.

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