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Bihar River Basin Floods Inundate Districts Along Major Waterways

Source:nationalheraldindia ↗

Why It Matters

Crucial for understanding Bihar's recurring disaster management challenges, river geography, and monsoon impacts relevant to BPSC General Studies.

Summary

Severe flooding affected over 4.3 lakh people across Bihar as major rivers such as the Ganga, Gandak, and Kosi breached danger marks, driven by heavy rains and intense water discharge from upstream.

Key Points

  • Over 4.3 lakh people were affected by severe flooding in Bihar as major rivers including the Ganga, Gandak, and Kosi crossed the danger mark.
  • Heavy water discharge from barrages and incessant rainfall heightened flood risks across multiple districts in the state.
  • The recurring floods in Bihar highlight vulnerabilities in the northern plains caused by Himalayan rivers shifting courses and overflowing their basins.

Prelims Trap

The Kosi River originates entirely within the Indian plains before entering Bihar.

Aspirants often confuse the Kosi river's origin as entirely within Indian territory, whereas it is a transboundary river formed by multiple Himalayan tributaries in Tibet and Nepal.

Static Concepts Connected

Geography of Bihar

What are the major structural causes and geographical features of floods in North Bihar?

  • Himalayan Siltation:: North Bihar rivers originate in the Himalayas, bringing massive silt deposition that raises riverbeds and causes frequent course shifts.
  • Kosi Migration:: The Kosi River is historically notorious as the 'Sorrow of Bihar' due to its extreme eastward lateral migration.
  • Monsoon Surges:: Heavy monsoon downpours combined with synchronized water releases from barrages like Valmikinagar (Gandak) and Birpur (Kosi) overwhelm embankments.

Cross-Topic Patterns

  • Bihar Floods + Indo-Nepal Water Treaties

    Bihar's flood management intersects with inter-state water tribunals and treaties like the Gandak and Kosi projects agreed upon with Nepal.

BPSC frequently tests Himalayan river origins and their shifting courses; expect a map-based or flood-management policy question.

Linked PYQs · 3

Linked PYQs · 3

  • 2024-IBPSC_PRELIMSGS1

    Which river is known as the ‘Sorrow of Bihar’?

  • 2020BPSC_PRELIMSGS1

    Which of the following rivers flowing in Bihar is a north flowing river?

  • 2024-EBPSC_PRELIMSGS1

    Which of the following drainage systems drains the lands of Bihar?