Topic: Chapter 3 – Drainage – 7 | Geography - Class 9

Topic outline

Drainage - Questions Page

Ans.

East Flowing Rivers	West Flowing Rivers
1. Theses rivers flow into the Bay of Bengal.	1. Theses rivers flow into the Arabian Sea.
2. These rivers make deltas at their mouths.	2. These rivers make estuaries.
3. The river carries a large volume of water and considerable amount of silt.	3. The river carries a smaller volume of water and less silt.
4. These rivers have many tributaries.	4. These rivers have comparatively less number of tributaries.
5. Examples: the Mahanadi, the Godavari, the Krishna and the Kaveri	5. Examples: The Narmada and the Tapi

Ans. The rivers are important for the country’s economy because of the following reasons:

i. They provide water for irrigation and cultivation.

ii. The rivers give natural fresh water which is the basic requirement for the survival of animals and man.

iii. They provide water for domestic use.

iv. The silt deposits from rivers make the soil rich and arable so it could be easily brought under cultivation without significant labour.

v. Rivers provide cheap and efficient inland transport for trade and commerce.

vi. Their water is extensively used in irrigation and in developing hydroelectricity.

vii. They also provide water to reservoirs which are used for fishing and recreational activities.

viii. Some of the river basin and river shores are important tourist spots e.g. Narmada.

Ans.

Himalayan rivers	Peninsular rivers
1. Most of the Himalayan rivers are perennial.	1. A large number of the Peninsular rivers are seasonal.
2. They receive water from rainfall and melting snow of mountains and glaciers.	2. They receive water from rainfall only.
3. They carry a lot of silt and sand.	3. They carry very less or no silt and sand.
4. The two major Himalayan rivers, the Indus and the Brahmaputra originate from the north of the mountain ranges.	4. Most of the rivers of peninsular India originate in the Western Ghats and flow towards the Bay of Bengal.
5. The Himalayan rivers have long courses from their source to the sea.	5. The Peninsular rivers have short and shallow courses.
6. Their drainage basins are large in size.	6. Their drainage basins are small in size.
7. They have well-developed deltas.	7. Some rivers form delta while others form Estuary.