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Assam’s recurring floods result from the interaction of natural river dynamics, extreme rainfall and anthropogenic pressures.

Main Causes

  • Vast River Network: Assam has over 120 rivers, many originating in high-rainfall regions of Arunachal Pradesh, Meghalaya, Bhutan and China, resulting in substantial inflows during the monsoon.
  • Brahmaputra’s Dynamic Nature: High sediment load, braided channels and frequent changes in the Brahmaputra’s course intensify flooding and bank erosion, causing loss of land and settlements.
  • Ageing Flood-Control Infrastructure: Many embankments and flood-control structures are out date and were designed with limited understanding of the Brahmaputra’s complex hydrology.
  • Inadequate Drainage: Poor drainage capacity obstructs the rapid evacuation of floodwater, prolonging waterlogging.
  • Encroachment and Unplanned Urbanisation: Encroachment of wetlands, floodplains and drainage channels reduces natural water-storage capacity and disrupts water flows.

Thus, Assam’s flood crisis reflects both hydrological vulnerability and human-induced amplification, necessitating integrated, basin-level and ecosystem-based flood management.

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