Vol. 12, Issue 3 (2023)

Author(s):
Rajanna KB, Manjappa N, Harsha Nayak and Sruthisree C

Abstract:
Bellandur Lake is considered to be the largest water body in Bengaluru city with catchment area of 287sqm and water storing capacity of 17.66 million cubic feet. Water quality of this lake has been a major issue since for a long time with foam appearance and accidental burning of lake has become national importance in recent times. Eleven parameters, from three different locations, of the lake were monitored during March, 2014 and December, 2017. Majority of the Physico-chemical and biological parameters were beyond the optimal range for surface waters and were not in desirable limits. Heavy metals concentrations were also high, with major source from untreated sewage, industrial effluents, solid waste, etc. The dissolved oxygen was nil in many locations and seasons during the study period. The high BOD concentrations indicated that this lake contains copious amount of organic load that utilizes dissolved oxygen for decomposition, by microbes, and makes the water body anaerobic on several occasions. There is urgent need to initiate proper management measure to rejuvenate this water body by stopping all the illegal entry of pollutants.