Kerala Flood Crisis

Context

Heavy rains in August 2026 led to devastating floods in Kerala, highlighting the enhanced effect of extreme rainfall due to rapid urbanisation, stressed river systems and shrinking wetlands.

Key Highlights

• The severe flood in early August 2026 occurred in Kottayam, Pathanamthitta, Alappuzha and a few other districts of Kerala.
• The floods left 26 people dead, thousands homeless and more than 27,000 people living in relief centres.
• Experts blame environmental degradation caused by humans as the root cause of the regularity of flood problems, with intense monsoon rain as the direct cause.

Why Are Floods Becoming More Severe in Kerala?

• Declining Carrying Capacity of Rivers

  • The rivers have lost the capacity to safely carry flood waters in Kerala.
  • Reasons
    • There has been high sedimentation in the rivers over the last ten years.
    • During 2018 Kerala floods, a huge amount of silt and sand was deposited in rivers.
    • Frequent landslides are still continuing to dump soil and debris into the rivers in the Western Ghats.
    • Sand bars and river deltas are created that block the flow of water.
  • Impact
    • Rivers will burst their banks even in brief periods of heavy rain.
    • Rising numbers of flash floods.
    • Reduced drainage efficiency.

• Sedimentation in Reservoirs and Dams

  • The storage capacity in reservoirs has been reduced substantially.
  • Major Issues
    • Continuous accumulation of silt that is continuous.
    • Limited desilting operations.
    • Lack of regular sediment studies.
  • CAG Findings
    • The loss of storage capacity was almost 47% in Kallarkutty Dam.
    • A loss of approximately 31% in the capacity of Anayirankal Dam was observed.
    • The reduced storage results in the early release of excess water during periods of heavy rain.

• Loss of Wetlands and Paddy Fields

  • The natural flood buffers in Kerala have been lost at a fast rate.
  • Land Use Changes
    • Land use change from paddy fields to urban land use.
    • Encroachment of wetlands.
    • Urban expansion.
  • Declining Wetland Area
    • The area of paddy fields decreased significantly in the last 40 years.
    • Wetlands and marshlands have been greatly reduced.
  • Impact
    • Reduced groundwater recharge.
    • Decrease the ability to absorb water naturally.
    • Greater surface runoff.
    • Increased urban flooding.

• Rapid Urbanisation and Impervious Surfaces

  • The natural hydrology of Kerala has been changed.
  • Factors
    • Expansion of roads.
    • Concrete buildings.
    • Tarred highways.
    • Paved urban landscapes.
  • Impact
    • No infiltration of rainwater is possible in the soil.
    • Rivers and drains quickly fill up with water.
    • Rapid water level increases on rivers.
    • Flash floods have a time frame of hours.

• Climate Change and Extreme Rainfall

  • The variability of rainfall is also increasing due to climate change.
  • Observed Trends
    • More frequent cloudbursts.
    • Short-duration, high-intensity rainfall.
    • More extreme weather conditions.
  • Impact
    • Existing drainage systems are overwhelmed.
    • The ecosystems that are degraded increase the risks of disasters.

Major Consequences

• Human Impact
  • Loss of lives.
  • Large-scale displacement.
  • Home damage, damage to public facilities.
  • Higher incidence of diseases related to water-borne diseases.
• Economic Impact
  • Crop losses.
  • Damage to roads, bridges and public utilities.
  • Decline in tourism.
  • Raising disaster relief spending.
• Environmental Impact
  • Soil erosion.
  • Riverbank collapse.
  • Habitat destruction.
  • Water pollution.
  • Biodiversity loss.

Government Initiatives

• The government of Kerala has suggested the following measures:
  • River and Reservoir Management.
  • River desilting on a large scale.
  • Desilting reservoirs to provide more storage.
  • Scientific river management.
  • Ensuring protection of Water Bodies.
  • Development of asset registers for rivers & lakes.
  • Prevention of encroachments through land audits.
  • Re-establishment of natural drainage channels.
• Sustainable Sand Mining
  • Environmentally sensible river extraction of sand (scientific)
  • Earning money, keeping the environment alive.

Challenges

• Rapid urbanisation continues.
• Encroachment of floodplains.
• Poor land use law enforcement.
• Poor city climate preparedness.
• High cost of desilting operations.
• Increased frequency of extreme precipitation events as a result of climate change.

Way Forward

• Improve River Basin Management
  • Periodic cleaning of rivers and reservoirs.
  • Scientific watershed management.
  • Sediment Accumulation Monitoring (SAM).
• Restore Natural Ecosystems
  • Manage wetlands/marshes.
  • Prevent paddy fields from being converted.
  • Encourage rejuvenation schemes in rivers.
• Climate-Resilient Urban Planning
  • Limit development on floodplains.
  • Introduce permeable pavements.
  • Design sustainable urban drainage systems (SUDS).
  • Increase urban green spaces.
• Improve Disaster Preparedness
  • Improve flood forecasting capabilities.
  • Further expand early warning mechanisms.
  • Improve evacuation planning.
  • Improve community-oriented disaster management.
• Adopt Nature-Based Solutions
  • Afforestation of catchment areas.
  • Riverbank stabilisation.
  • Mangroves to be restored if possible.
  • Water resource management that integrates.

Source: The Indian Express

Mains PYQ

Q. Account for the huge flooding of million cities in India including the smart ones like Hyderabad and Pune. Suggest lasting remedial measures. (2020)

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