Chennai Explores Sustainable Water Supply Alternatives Amid Mamallan Reservoir Controversy
Fisher communities in Chennai oppose the Mamallan reservoir project, advocating for sustainable alternatives. Experts propose rainwater harvesting and desilting existing tanks to address the city's projected drinking water supply crisis, which may escalate to over 2,500 million liters per day by 2035.
Theia Market Signal Identification - AI AssistedThe Mamallan reservoir project is facing opposition from fisher communities and experts due to concerns over costs and environmental impacts. The project is projected to supply 1.65 TMC of water, while Chennai's demand is expected to exceed 2,500 MLD by 2035, highlighting a significant supply risk.
Alternatives suggested include desilting tanks and rainwater harvesting, which could yield additional water resources at a fraction of the project's estimated ₹400 crore cost. Over 3,600 water bodies in the surrounding districts could be utilized.
Additionally, the proposed use of abandoned quarries for water retention could mitigate evaporation losses. Groundwater harvesting is recommended to replenish diminishing aquifers, which have declined in 29 of 38 districts as of February 2026. Immediate government enforcement of rainwater harvesting laws is essential to enhance water security.
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