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IIT Roorkee Study: Lake Aeration Reverses Decline
4 Jul
Summary
- Artificial aeration significantly improved Naini Lake's water quality.
- Study shows reduced thermal stratification and harmful algal blooms.
- Pollution and climate change remain threats to full recovery.
Researchers from the Indian Institute of Technology (IIT), Roorkee, have published findings demonstrating the positive impact of artificial aeration on Naini Lake's water quality. This intervention has helped reverse significant ecological damage, including toxic algal blooms and low dissolved oxygen levels that previously led to winter fish mortality.
The study, published in 2026, assessed a diffused air aeration system installed in 2007. Before aeration, Naini Lake, a vital drinking water source and tourist hub, suffered from hyper-eutrophication due to urbanization and runoff. The system's implementation has largely kept the lake well-mixed, reducing the duration of strong thermal stratification from 8-9 months annually to less than four.
While the aeration has substantially improved water quality by increasing oxygen levels and limiting harmful algae, researchers caution that full recovery is not assured. Low oxygen conditions still develop near the lake bed in summer, and pollution and climate-related factors continue to pose threats to the lake's ecosystem.
