Class 9 Social Science - BIHAR
Drainage
The chapter 'Drainage' in Class 9 Geography explores the river systems of India, which is crucial for understanding the country's physical geography, climate, and agriculture. Students study the difference between Himalayan and Peninsular rivers, major river basins, lakes, and the role of rivers in the economy. This chapter is very important for Bihar Board (BSEB) exams as it features frequently in both objective and subjective sections, including map-pointing questions related to major rivers and lakes in India.
Start Learning FreeKey Concepts
Drainage System
The flow of water through well-defined channels is known as drainage, and the network of such channels is called a drainage system.
Catchment Area and River Basin
The area drained by a single river system is called a river basin, while a specific river and its tributaries drain a specific catchment area.
Himalayan Rivers
Perennial rivers originating from the Himalayas that receive water from both melted snow and rains, such as the Ganga, Brahmaputra, and Indus.
Peninsular Rivers
Seasonal rivers originating in the peninsular plateau that depend entirely on rainfall, such as the Narmada, Tapi, Mahanadi, Godavari, Krishna, and Kaveri.
National River Conservation Plan (NRCP)
A government initiative launched to improve the water quality of rivers through the implementation of pollution abatement works.
Important Formulas
Board Exam Info
In the Bihar (BSEB) Class 9 Social Science examinations, this chapter typically carries around 4 to 6 marks. Common question types include multiple-choice questions about river origins, short-answer questions differentiating between Himalayan and Peninsular rivers, and map-based questions requiring students to locate major rivers and lakes.
Frequently Asked Questions
What is the difference between Himalayan and Peninsular rivers?
Himalayan rivers are perennial (flow throughout the year) and originate from snow-covered mountains. Peninsular rivers are seasonal, depend on rainfall, and have shorter, shallower courses.
Why are rivers important for the Indian economy?
Rivers provide water for irrigation, generate hydroelectricity, support navigation, and serve as a vital source of livelihood for millions of people engaged in fishing and agriculture.
What is a water divide? Give an example.
A water divide is an elevated area that separates two adjacent drainage basins. The Ambala water divide separates the Indus and Ganga river systems.
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