Tamil Nadu’s Impact of Monsoons

• The northeast monsoon has arrived earlier than expected, causing heavy rainfall that exceeds the long-period average.

• Excess rain is causing urban areas to be overwhelmed, waterlogging farmland, and straining infrastructure.

• The Mullaperiyar Dam inflow adds a “double whammy” to Tamil Nadu rivers and reservoirs.

• Waterlogged soil, overflowing rivers, and stagnant water create crop damage, health hazards, and threats to buildings, roads, and public safety.

• Excess rainfall is a concern due to the impact on urban areas, infrastructure, and the agricultural sector.

• Urban power authorities are prone to cut power supply due to loose cables and sewage overflows.

• The agricultural sector is vulnerable to excessive rainfall, with waterlogged soil suffocating plant roots, washes away seeds and young crops, and allowing the spread of fungal diseases and pests.

• Intense bursts can wash agricultural debris into waterbodies, degrading water quality, and becoming a breeding ground for mosquitoes.

• Prolonged periods of rainfall raise the water table, compromising the stability of building foundations, roads, and other infrastructure.

• The cumulative impact of these issues translates to significant economic and social costs, including damage to buildings, public infrastructure, and agricultural land, disruptions to businesses and transport networks, and displacement of communities.

• Tamil Nadu is particularly vulnerable due to the Kerala factor, as the two States receive rain from different monsoon patterns.

• The Mullaperiyar Dam, located in Kerala’s Idukki district, is at the heart of the issue, with a ‘direct’ link between rainfall in Kerala’s catchment areas and water levels in Tamil Nadu’s river systems.

• The simultaneous influx of Kerala’s “excess” water from Kerala into Tamil Nadu turns it into an immediate flood risk.

• The State is currently keeping all 13 shutters of the Mullaperiyar Dam open, releasing thousands of cusecs of water to make room for the incessant influx.

Monsoon Impact Tamil Nadu is important topic for Civil service exam (WBCS).

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