: With the continued flow of sewage into , , a free-floating perennial aquatic plant, is back again in the lake, marring the beauty of the historic lake.
Last year, city-based had taken the initiative to remove the weed. But hyacinth covers most of the lake again. According to Hubballi-Dharwad Municipal Corporation (HDMC) sources, hyacinth has increased in the lake due to flow of sewage. A proposal to treat the sewage before it is released into the lake is still pending with the .

Tourists and local residents have demanded that the water hyacinth is removed permanently. Shreenivas Rao, a private company employee, said, “A permanent solution is not been found to solve the problem. The lake looks ugly from the nearby flyover of the BRTS. The lake is a tourist attraction and it is now on the verge of losing its beauty.”

When TOI tried to HDMC commissioner C W Shakeel Ahmed for his response, he was unavailable to .

Historic lake

Unkal lake was constructed by eminent engineer Bharat Ratna Sir M Visvesvaraya in 1893. The lake is spread over 262 acres and has a maximum depth of 20 feet. With an average depth of 2.5 m, the total water holding capacity of the lake stands at around 26,50,785 cubic metres. The total area of the lake is less than 3% of the catchment area. Hence, the Unkal lake behaves as a detention tank. Water is stored in the reservoir until its water holding capacity, after which it is discharged through a weir.

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