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Abstract: This study assesses the 2019 water quality of five major lakes in Chennai—Ambattur, Korattur, Perungudi, Velachery, and Rettai Eri—highlighting significant contamination driven by urbanization and industrial activities. Water samples from these lakes were analyzed for key geo-chemical parameters, including calcium, magnesium, carbonates, bicarbonates, sulfates, sodium, chlorides, total dissolved solids (TDS), pH, electrical conductivity (EC), and potassium. The results revealed substantial contamination due to residential sewage and urban runoff. For instance, Velachery Lake exhibited the most significant contamination, with only 24.78% of its original area remaining and 75.22% encroached upon. The other lakes also showed high levels of pollution, reflecting the severe impact of urban expansion on water quality. These findings emphasize the urgent need for comprehensive water management strategies and targeted interventions to mitigate pollution and restore the ecological balance of these lakes. Effective measures such as strict zoning law enforcement, restoration projects, public awareness campaigns, and regular monitoring are essential to preserve the hydrological and ecological functions of Chennai's urban lakes, ensuring their long-term sustainability and health.
Imrana Banu F (Wed,) studied this question.