Rivers & Water Resources — Study Notes

Overview

Water resources form a critical component of Geography in UPSSSC PET, with 5–8 questions typically appearing from this topic. The exam tests your knowledge of major Indian river systems (origin, tributaries, length, dams), important lakes (natural and artificial), and world's major rivers. Understanding river courses, drainage patterns, and multipurpose projects is essential not just for direct questions but also for linking with Indian Economy (irrigation), Environment (water conservation), and Current Affairs (river disputes, dam projects). Focus on the Ganga-Brahmaputra system, peninsular rivers, major dams like Bhakra Nangal and Hirakud, and world rivers like Nile, Amazon, and Yangtze. This topic rewards systematic memorization of facts combined with map visualization.

Key Concepts

• **Drainage Basin**: The entire area drained by a river and its tributaries. India has four major drainage basins: Himalayan rivers (perennial, snow-fed), Peninsular rivers (seasonal, rain-fed), Coastal rivers, and Inland drainage.

• **Perennial vs Seasonal**: Himalayan rivers like Ganga, Indus, Brahmaputra are perennial (flow year-round) due to glacial melt and monsoons. Peninsular rivers like Godavari, Krishna, Kaveri are seasonal, depending mainly on monsoon rainfall.

• **Drainage Patterns**: Dendritic (tree-like, most common), trellis (rectangular pattern), radial (from central peak), and centripetal (converging inward). Understanding these helps in topographical questions.

• **Multipurpose Projects**: Dams serve irrigation, hydroelectric power, flood control, navigation, and drinking water. Key examples: Bhakra Nangal (Sutlej), Hirakud (Mahanadi), Sardar Sarovar (Narmada).

• **River Linking**: National River Linking Project aims to transfer water from surplus to deficit basins. Ken-Betwa link is the first approved project, important for current affairs.

• **Lake Classification**: Natural lakes (glacial like Wular, tectonic like Chilika, crater like Lonar) vs artificial/man-made reservoirs (Gobind Sagar behind Bhakra, Indira Sagar on Narmada).

• **International Rivers**: Rivers crossing multiple countries create cooperation and conflict zones. Indus (India-Pakistan treaty 1960), Brahmaputra (China-India-Bangladesh), Ganga (India-Bangladesh).

• **Water Disputes**: Interstate water disputes in India are adjudicated by tribunals under Interstate River Water Disputes Act 1956. Examples: Kaveri (Karnataka-Tamil Nadu), Ravi-Beas (Punjab-Haryana).

Formulas / Key Facts

**Major Indian Rivers (Himalayan System)**