Flooding in urban areas is an emerging climate-induced disaster. Discuss the causes of this disaster. Mention the features of two such major floods in the last two decades in India. Describe the policies and frameworks in India that aim at tackling such floods.

Introduction

Urban flooding has emerged as a significant climate-induced disaster in recent years, exacerbated by rapid urbanization, unplanned development, and changing rainfall patterns due to climate change. Events like the Mumbai floods (2005) and the Chennai floods (2015) highlight the growing vulnerability of Indian cities to such disasters, causing loss of life, property, and economic disruption.

Key Dimensions of Urban Flooding in India

Causes of Urban Flooding

1. Climate Change and Extreme Weather Events

• Increased frequency of intense rainfall due to global warming (e.g., Mumbai received 944 mm rainfall in 24 hours during the 2005 floods).
• Rising sea levels aggravate coastal flooding in cities like Mumbai and Chennai.

2. Unplanned Urbanization

• Encroachment on natural drainage systems such as rivers, lakes, and wetlands (e.g., Chennai’s Pallikaranai marshland reduced by 90%).
• Construction on floodplains reduces water absorption capacity.

3. Inadequate Urban Infrastructure

• Outdated drainage systems unable to handle high-intensity rainfall (e.g., Mumbai’s colonial-era stormwater drains designed for 25 mm/hour rainfall).
• Solid waste mismanagement blocks drainage channels, worsening waterlogging.

4. Loss of Natural Buffers

• Deforestation and loss of green cover reduce water infiltration and increase surface runoff.
• Destruction of wetlands eliminates natural flood absorbers.

5. Policy and Governance Gaps

• Poor enforcement of urban planning regulations leads to haphazard development.
• Lack of coordination between municipal bodies and disaster management agencies.

Features of Two Major Urban Floods in India

Policies and Frameworks to Tackle Urban Flooding

1. National Disaster Management Guidelines (2008)

• Issued by the National Disaster Management Authority (NDMA), focusing on urban flood management.
• Emphasizes stormwater drainage systems, rainwater harvesting, and flood forecasting.

2. Atal Mission for Rejuvenation and Urban Transformation (AMRUT)

• Aims to improve urban infrastructure, including stormwater drainage and sewage systems.

3. Smart Cities Mission

• Promotes sustainable urban planning with a focus on climate resilience and flood mitigation.

4. National Action Plan on Climate Change (NAPCC)

• Includes the National Water Mission to ensure efficient water management and reduce urban flooding risks.

5. State-Specific Initiatives

• Maharashtra’s Flood Management Plan: Focuses on Mithi River rejuvenation.
• Tamil Nadu Wetlands Mission: Aims to restore wetlands like Pallikaranai marsh.

6. Early Warning Systems

• Use of Doppler radar technology for real-time weather monitoring and flood forecasting.

7. Urban Flood Resilience Guidelines (2020)

• Advocates for nature-based solutions like restoring wetlands and creating urban green spaces.

Way Forward

• Integrated Urban Planning: Enforce zoning laws to prevent construction on floodplains and wetlands.
• Nature-Based Solutions: Restore natural buffers like wetlands and mangroves.
• Infrastructure Upgradation: Modernize drainage systems to handle high-intensity rainfall.
• Community Participation: Involve local communities in flood preparedness and waste management.
• Technology Integration: Use AI and GIS for flood risk mapping and real-time monitoring.

Conclusion

Urban flooding is a multi-dimensional challenge requiring a combination of policy reforms, infrastructure upgrades, and community participation. By aligning with SDG 11 (Sustainable Cities and Communities) and leveraging frameworks like the Sendai Framework for Disaster Risk Reduction, India can build climate-resilient urban centers and mitigate the impact of future floods.