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Drainage

ICSE · Class 12 · Geography

Quick revision notes for Drainage — ICSE Class 12 Geography. Key concepts, formulas, and definitions for last-minute revision.

44 questions38 flashcards5 concepts

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Key Topics to Revise

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1. Evolution of Indian Drainage

  • The present drainage of India is the result of a long process of evolution.
  • Two broad divisions are recognised on the basis of evolution: Himalayan rivers and Peninsular rivers.
  • Himalayan rivers are typical examples of antecedent drainage because they existed before the Himalayas were fully formed.
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2. Himalayan River System

  • The Himalayan river system includes the Indus, Ganga, and Brahmaputra systems.
  • Himalayan rivers are long, have large basins, and are perennial because they receive water from both snow-melt and rainfall.
  • They form deep gorges, meanders, and large deltas.
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3. Indus Drainage System

  • The Indus system comprises the Indus and its five main tributaries: Jhelum, Chenab, Ravi, Beas, and Satluj.
  • The Indus rises in Tibet at an altitude of 5,180 metres near Manasarowar Lake.
  • It flows through Ladakh, Baltistan, and Gilgit, emerges at Attock, and reaches the Arabian Sea east of Karachi.
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4. Ganga Drainage System

  • The Ganga drainage system includes the Ganga and tributaries such as Yamuna, Gomati, Ghaghara, Gandak, Ramganga, Mahaganga, and Kosi.
  • The Ganga rises in Garhwal Himalayas in Uttarakhand at an altitude of 6,600 metres.
  • The river acquires its name after Alaknanda and Bhagirathi unite at Devaprayag.

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Full Notes

Key Concepts

Indian drainage is classified into HimalayanHimalayan rivers are typical examplesA mighty ancient stream calledThe Indobrahma river was broken intoPeninsular rivers are older

Frequently Asked Questions

What are the important topics in Drainage for ICSE Class 12 Geography?
Key topics in Drainage include Mind map showing the two major river systems and factors influencing their evolution, Flowchart showing the process of Indobrahma river dismemberment into present-day systems, Flowchart showing major criticisms of the Indobrahma Theory. These are the concepts ICSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Drainage — ICSE Class 12 Geography?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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