Floods shift course. State response is static, Pg10

Key Highlights:

• Unprecedented floods have affected Upper Assam districts including Sivasagar, Charaideo, Jorhat, and Golaghat, areas typically less prone to severe flooding.
• Over 20 people died within 24 hours after a wall of water from Nagaland’s Mon district spilled into Assam.
• The floods are attributed to the Brahmaputra river's tendency to shift course and its elevated riverbed due to sediment deposition.
• The state's flood management strategy, heavily reliant on embankments, has been criticized as static despite changing flood patterns.

Detailed Insights:

• The recent floods have impacted regions far from the main Brahmaputra banks, with water draining over open terrain rather than just through tributaries.
• The Brahmaputra's reduced gradient in the Assam valley causes it to slow down and deposit sediment, raising the riverbed and decreasing its capacity.
• This topographical change has increased flood risks in Upper Assam, which were historically more associated with downstream areas.
• Heavy rainfall in Nagaland's Mon district, exceeding a third of its average July rainfall in eight hours, triggered landslides and contributed to the floodwaters.
• The incident highlights the need for an institutional mechanism to manage rivers as shared ecological systems and ensure inter-state coordination.
• The Brahmaputra Board, an agency responsible for flood management, has been hampered by staff shortages and inadequate technical capacity.
• There is a pressing need for the Centre and state governments to reinvigorate the Brahmaputra Board to address increasingly frequent extreme weather events.

Key Concepts Involved:

• Brahmaputra Board: An autonomous body under the Ministry of Jal Shakti, Government of India, responsible for flood management and water resource development in the Brahmaputra basin.
• Climate Change: Long-term shifts in temperatures and weather patterns, leading to more frequent and intense extreme weather events like heavy rainfall and floods.
• Embankments: Artificial banks or walls built along rivers to prevent flooding of adjacent land.
• Topography: The arrangement of the natural and artificial physical features of an area, influencing river flow and flood patterns.