Mulling over best way to rejuvenate the lake and taking almost a year, the committee headed by additional chief secretary, urban development, has in an eight-page report, listed out various possibilities that can be taken up on short-term and long-term basis to provide a fresh lease of life for the frothing lake in the IT corridor of Bengaluru.
The experts’ committee, which met almost ten times, has entrusted the responsibility to various civic agencies to oversee the rejuvenation works. While the short-term measures can be taken up over the next six months, the long-term ones have been advised to be taken up over the next three to four years.
The committee has held untreated sewage flowing into the lake as the root cause of all the problems. According to a copy of the recommendations, which was accessed by Bangalore Mirror, the experts have recommended regular removal of macrophytes (weeds) which cut down nutrients from accumulating.
Bangalore Development Authority (BDA) has been entrusted with the responsibility of removing the aquatic weeds from the lake. This apart, the Bruhat Bengaluru Mahanagara Palike (BBMP) has been directed to ensure that dumping of municipal solid waste is stopped and all waste processing units in the lake’s vicinity – and the lake bed – are evicted.
Guiding the urban development department, the committee has directed its officials to stop dumping construction and demolition debris in rajakaluves, valley zones and lake beds through which the lake gets its water during rainy season.
The Karnataka State Pollution Control Board (KSPCB) and the Bangalore Water Supply & Sewerage Board (BWSSB) have been directed to ensure that all apartments in the lake’s vicinity let only treated water into the lake. The recommendations mandate installing online water quality monitors at the treated water outlets which let in water into the lake, besides and installing surveillance cameras at the lake inlets to keep tabs on public dumping or mixing wastes into the lake inflow.
Addressing the frothing issue, although experts have suggested to build a ramp so that the velocity of water is brought down, the committee recommended urging the Central government to ban the use of phosphorous in detergents or regulate markets with detergents with high phosphorous content.
Installation of fountains and widening of channels has been recommended to increase oxygen levels in the lake water.
As part of long term measures, the committee has recommended commissioning of sewage treatment plant (STP) with 90 million litres/day (MLD) capacity on the upstream of Varthur Lake, 60 MLD STP at Koramangala and Challaghatta Valley (Agara), and another 150 MLD STP in the same valley (Ejipura Drain) between 2017 and 2020.
Credits Bangalore Mirror