Q. What are the environmental implications of the reclamation of the water bodies into urban land use? Explain with examples.

Model Answer: 

Unplanned urbanization often reclaims wetlands and lakes for infrastructure development, severely disrupting natural ecological balances and creating extreme urban vulnerabilities.

Hydrological Impacts & Disaster Vulnerability

• Loss of flood sinks: Destruction of natural drainage causes severe urban inundation (e.g., 2015 Chennai floods due to Pallikaranai marsh encroachment).
• Groundwater depletion: Cemented catchments prevent percolation, exacerbating acute urban water crises (e.g., rapid drying of borewells in Bengaluru).
• Water contamination: Reduced water volumes drastically increase pollutant concentration and toxicity (e.g., toxic foam and fires in Bellandur Lake).

Ecological Degradation & Micro-climate Alteration

• Biodiversity collapse: Habitat destruction decimates local aquatic flora and migratory bird populations (e.g., flamingo decline in Mumbai’s reclaimed Uran wetlands).
• Micro-climate alteration: The disappearance of natural cooling water bodies significantly intensifies the Urban Heat Island (UHI) effect.
• Loss of carbon sinks: Reclaiming wetlands releases stored greenhouse gases, accelerating localized climate change impacts.

Mitigating these impacts requires integrating “Sponge City” concepts into urban planning and strictly enforcing the Wetlands (Conservation & Management) Rules, 2017.