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

Introduction

Land reclamation involves converting water bodies, wetlands, or low-lying muddy areas into dry land for urban, agricultural, or industrial use. While it addresses urban land scarcity, it carries severe ecological consequences.

Body

Environmental Implications:

• Disruption of Aquatic Ecosystems: Urban encroachment around water bodies leads to severe pollution, nutrient loading (eutrophication), and ecological degradation (e.g., Dal Lake in Srinagar).

• Increased Vulnerability to Flooding: Wetlands act as natural sponges absorbing excess rainfall. Reclaiming them drastically reduces natural drainage capacity, leading to urban floods. For instance, Mumbai lost 71% of its wetlands between 1970 and 2014, exacerbating flood risks.

• Loss of Biodiversity and Species Extinction: Encroachment of lakes like Hussain Sagar in Telangana has raised Biological Oxygen Demand (BOD) to critical levels (116 mg/l), decimating aquatic life and affecting migratory birds.

• Contamination of Drinking Water: Natural water bodies filter and recharge groundwater. Their degradation leads to the concentration of hazardous heavy metals like arsenic, copper, and chromium in aquifers (e.g., arsenic contamination in West Bengal).

• Geophysical Hazards: Reclaiming coastal land increases susceptibility to soil liquefaction and land subsidence during seismic events.

Conclusion

Water bodies are vital ecological assets providing essential services like groundwater recharge, flood mitigation, and climate regulation. Their conservation is indispensable for sustainable urban planning.