Climate change is exacerbating Global Flooding

Syllabus: Geography: Disaster Management

Source: IE

Context: Climate change is exacerbating global flooding by increasing the frequency and intensity of heavy rainfall.

How does Climate change affect Global flooding?

Rising temperatures enhance the atmosphere’s capacity to hold moisture, leading to more intense downpours. For instance, a 1.5°C increase in global temperatures could make heavy rainfall events 1.5 times more frequent and 10% wetter. Recent floods in Europe, the UAE, and Brazil highlight this trend. If global temperatures rise by 2°C, such floods could occur 1.7 times per decade, with 14% more rainfall.

Implications:

1. Increased Rainfall Intensity: Example: Heavy rainfall in Germany in 2021 was intensified by climate change, leading to severe floods in western regions.
2. Higher Atmospheric Moisture: Example: The UAE and Oman experienced record-breaking rainfall in 2023 due to warmer air holding more moisture.
3. More Frequent Extreme Rainfall Events: Example: In Europe, floods this summer were more intense due to the increased frequency of extreme rainfall events linked to climate change.
4. Transition from Snow to Rain: Example: Increased rainfall in high-altitude regions, such as the Alps, has led to more frequent flooding and landslides as snow transitions to rain.
5. Increased Flood Risk in Urban Areas: Example: Rapid urbanization in cities like Dhaka, Bangladesh, has led to higher flood risk as cities expand into flood-prone areas.
6. Greater Impact on Low-Income Countries: Example: Floods in India and China have displaced millions due to increased flooding risk from climate change, affecting mostly low-income populations.
7. Rising Sea Levels: Example: Coastal flooding in cities like Miami, USA, has been exacerbated by rising sea levels linked to global warming.

Other factors leading to flooding:

1. Deforestation and Land Use Changes: Unsustainable deforestation in the upper catchments increases soil erosion and sediment load in rivers, reducing their carrying capacity and causing overflows.
   1. Eg: Sundarbans flooding attributed to these.
2. Encroachment on Floodplains: Building settlements and infrastructure on floodplains obstructs natural drainage and reduces buffer zones, amplifying flood impacts.
   1. Eg: Bihar floods are particularly severe due to the encroachment of floodplains.
3. Inadequate Drainage and Infrastructure: Insufficient drainage systems, choked rivers, and dilapidated embankments cannot handle excessive water, leading to widespread inundation.
   1. Eg: Inadequate and weak embankments are annually breached in Bihar-West Bengal floods.
4. Poor Urban Planning: Urbanization without proper water management and flood zoning increases runoff and exposes more people to risks.

Strategies can be implemented to mitigate the risks associated with these floods:

1. Early Warning Systems: Implement advanced early warning systems to provide timely alerts to communities, enabling them to evacuate and take preventive measures.
   • E.g.: Flood Early Warning System (FLEWS) in Assam by its state disaster management authority.
2. Eco-Restoration: Undertake comprehensive eco-restoration initiatives, including reforestation and wetland conservation, to enhance natural drainage systems and reduce vulnerability.
   • Eg: the Red River Delta Rehabilitation Project restored over 100,000 hectares of mangroves and wetlands which can be replicated here.
3. Infrastructure Development: Invest in resilient infrastructure, such as embankments, flood shelters, and drainage systems, to protect communities and vital assets.
   • Eg: Coastal Embankment Improvement Project (CEIP) in Bangladesh part of the delta.
4. Community Engagement: Foster community-based initiatives for flood preparedness, including training in disaster response, and involve local communities in planning and decision-making processes.
   • E.g.: Community Preparedness and Adaptation of “Living with Floods” under Flood Risk Mitigation and Management.
5. Climate-Resilient Agriculture: Promote climate-resilient agricultural practices and crop varieties to minimize the impact of floods on the agrarian economy.
   • E.g.: Integrated Rice-Fish Farming System (IRFFS) promoted by the World Food Programme.

NDMA Guidelines for Floods:

Conclusion:

As seen above, many factors are natural and inevitable to a certain extent, thus, mitigating the risks associated with annual floods in the Ganges-Brahmaputra Delta requires a holistic and integrated approach that combines physical infrastructure, sustainable land-use practices, community engagement, and international cooperation.

Insta Links: 

1. Assam Floods

Prelims Link: