Rapid urban expansion in Chennai is straining the city’s water resources, jeopardizing its long-term water security. A recent assessment by the Tamil Nadu Green Climate Company and the Council on Energy, Environment and Water reveals that the disappearance of traditional water storage systems due to urban development could exacerbate water shortages in the future. The study emphasizes the urgent need for improved planning and conservation of water bodies to mitigate these challenges.
The report highlights how Chennai has already lost a significant portion of its traditional tank storage capacity, impacting the region’s ability to store rainwater and regulate water supply during dry spells. Moreover, the expansion of urban areas beyond the city’s borders poses a threat to tank storage in neighboring districts, potentially intensifying water stress in the region despite seasonal rainfall.
The diminishing interconnected tanks and water bodies have weakened the natural hydrological resilience of the Chennai River basin, affecting rainwater storage, irrigation, and groundwater recharge. The assessment also points out the strain on sewage treatment systems, leading to untreated wastewater polluting rivers and canals, thereby deteriorating water quality in the basin.
Water security in the Chennai River basin, which encompasses several districts and contributes significantly to Tamil Nadu’s economy, is a critical concern. The report projects a substantial increase in water demand by 2050, with agriculture expected to remain the largest consumer. As water supply struggles to meet the escalating demands of agriculture, households, and industries, the region faces a widening gap between supply and demand.
Experts recommend enhancing water-use efficiency and implementing measures like expanding water recycling and promoting micro-irrigation to address the growing water deficit in the region. Improving these practices will be crucial for managing the future water needs of the Chennai River basin and ensuring sustainable water resource management.
