Why in news?
Authorities in Bengaluru have drained Ulsoor Lake for a full desilting and cleanup – the first such operation in nearly two decades. The lake’s water has been diverted and its bed exposed so workers can remove silt, debris and idols. Officials hope that restoring depth and improving water quality will make the lake healthier before the monsoon refills it.
Background
Ulsoor Lake, also known as Halasuru Lake, is one of the largest lakes in central Bengaluru. Covering roughly 50 hectares (123 acres), it was constructed in the 19th century by Commissioner Lewin Bentham Bowring on the site of an older tank. The lake has several small islands and is used for boating and recreation. Over the years, unchecked pollution from sewage, idols and encroachments has caused eutrophication and reduced depth. While partial cleanups have occurred, a complete desilting had not been undertaken since 2001–2002.
Highlights of the restoration
- Desilting and debris removal: Workers are removing silt layers up to one metre thick along with trash and religious offerings. Fish were relocated before draining, and inflows from storm‑water drains have been temporarily diverted.
- National Disaster Mitigation Fund: The Rs 4 crore project is financed through the National Disaster Mitigation Fund. It aims to increase the lake’s water holding capacity and reduce flood risk in surrounding neighbourhoods.
- Timeline and plans: Officials estimate that the desilting will take three to four months and that the lake will begin refilling naturally during the monsoon. Longer‑term plans include constructing walkways, ornamental fences and improved parks around the lake’s perimeter.
- Environmental concerns: Environmentalists emphasise that desilting alone will not solve pollution unless sewage inflows are permanently stopped. Ensuring that lake ecosystems are restored without harming aquatic life is another challenge.