Why in News?
Tidal flooding, also known as "sunny day" or nuisance flooding, is the temporary inundation of low-lying coastal land during exceptionally high tides, rather than from heavy rain or storm surges. It is currently in the news primarily due to Kerala's landmark decision to declare it a "State-specific disaster," a first for any Indian state.
About
- India's First: This is the first time an Indian state has formally acknowledged slow-onset tidal events—which occur roughly twice daily—as eligible for disaster relief.
- U.S. 2025-2026 Outlook: According to the latest NOAA High Tide Flooding Outlook, the U.S. is predicted to experience a median of 4 to 9 high tide flood days through April 2026, with the Pacific Islands seeing up to 20 days.
- UK Weather Alert: On 18 February 2026, the UK Environment Agency warned of high tidal flood risks across South West England due to persistent wet weather and strong winds expected through mid-March.
Key Information
- Core Causes:
- Spring Tides: Occur during full or new moon cycles when gravitational pull is strongest.
- Sea Level Rise: Climate change-induced rising oceans amplify the frequency and depth of these floods.
- Land Subsidence: In areas like the U.S. Gulf Coast or Venice, sinking land makes tidal ingress more severe.
- Characteristics:
- Can occur on calm, sunny days without any storm activity.
- Often impacts the same low-lying infrastructure repeatedly (roads, sewers, basements).
- Socio-Economic Impacts:
- Infrastructure Stress: Repeated saltwater exposure corrodes roads and overwhelms gravity-based drainage systems.
- Livelihood Loss: Fishermen, coastal farmers (due to soil salinity), and small traders face constant disruption.
- Public Health: Stagnant saline water increases risks of waterborne diseases and mold growth in homes.
- Severity Levels (NOAA Standards):
- Minor (0.55m): Mostly disruptive; leads to stormwater backups and road closures.
- Moderate (0.85m): Likely to damage homes and businesses.
- Major (1.20m): Destructive; often requires evacuations and major infrastructure repairs.
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