Avalahalli Lake: Green Circle addresses encroachments, pollution

Bengaluru, NT Bureau: The Avalahalli Lake, once a vibrant ecosystem supporting a diverse range of flora and fauna, faced numerous challenges due to urbanisation and neglect.

However, with the efforts of the Green Circle, a community-driven environmental organisation, improvement steps have been made towards the lake's rejuvenation and biodiversity conservation.

A major issue contributing to the lake's problems is the encroachment of Rajakaluves, the stormwater drains that feed and drain the lake. Encroachments have led to multiple issues such as blocked inlets and outlets, resulting in poor water flow and increased sedimentation.

"The Rajakaluve is incomplete as landowners are objecting. This hampers the lake's natural water replenishment," says Selvaraj.

Moreover, the outlet is completely clogged and has almost vanished, exacerbating the water stagnation and contributing to the proliferation of weeds and other issues.

"Encroached Rajakaluves in Bengaluru cause severe disruptions to the natural water flow of our lakes," says Selvaraj, a member of the Green Circle.

"Blocked inlets and outlets lead to waterlogging and flooding during the rainy season, which fosters weed growth and sediment buildup, severely degrading water quality."

"These encroachments prevent proper drainage, significantly increasing the risk of urban flooding and affecting groundwater recharge," he adds.

"Untreated sewage and industrial waste often get diverted into these blocked channels, further polluting our lakes. This pollution harms the ecosystem, reduces biodiversity, and poses serious health risks to local communities." However, several issues have been successfully addressed.

A steel compound wall constructed by BBMP now keeps unauthorised twowheeler entries at bay, and the gate remains closed to prevent further fishing.

Additionally, periodic plogging by Green Circle members and trash collection by PDO have significantly improved the cleanliness of the lake area. Despite the progress, the lake faces ongoing challenges. Non-cooperation from locals, lack of awareness, and unauthorised activities such as fishing and trash dumping have hindered the restoration efforts.

"Unauthorised fishing affects the ecosystem of the lake," emphasises Selvaraj, explaining the delicate balance required to maintain the lake’s biodiversity.

Selvaraj concludes, "Lakes are for groundwater recharging and better water resource management. They should not be treated as picnic spots or used for dumping."

The Green Circle's ongoing efforts underscore the importance of community involvement and government support in conserving and rejuvenating vital natural resources like Avalahalli Lake.