Articles by Priyanka Jamwal

Reports of massive fish kill events in lakes across Bengaluru come up worryingly often every year after the first monsoon showers. This year was no different. Ulsoor, Basavanapura, Muthanallur and Bhattarahalli are some of the lakes in which dead fish were found floating over the last few weeks. What is causing this morbid scene year after year in a city famed for its many water bodies? Pollution is one culprit. What are the other factors involved? How exactly do these interact and impact lake ecosystems? And what needs to be focused on to prevent such events? To understand the whole…

Bengaluru’s water supply is met either by pipelines that draw water from the Cauvery river several kilometers away, or by pipelines that are sunk several feet underground. It wasn’t always like this. In the past, Bengaluru’s water needs were quenched by the many lakes built across the city. Lake water was used for drinking, agriculture, washing cattle and other purposes. But in recent years, the city’s lakes have become infamous for catching fire, frothing, and becoming dump sites. Many lakes are heavily polluted as the city’s sewage, industrial contaminants and untreated wastewater enter them via stormwater drains, rendering them unusable.…

One of the characteristic features of a lake is its colour.  You may have noticed that the water in many lakes in Bengaluru is green, and not blue, as you might have imagined it to be. This is due to the presence of algae. Algae are microscopic plants that contain chlorophyll which is the pigment that gives it a green colour. While some amount of algae is healthy for the lake ecosystem, excess algae can be harmful and is an indicator of a polluted and nutrient-rich lake. Lakes rich in nutrients such as nitrogen and phosphorus are called eutrophic lakes,…

Many lakes in Bengaluru, such as Kaikondrahalli, Kasavanahalli and Kalkere lakes, have foamed before. But the quantity of foam in Varthur and Bellandur lakes are alarmingly high.  In our previous article, we saw that fire occurs in Bellandur and Varthur lakes mainly because about 40% of the city's sewage is discharged into the catchment areas of these lakes. Apart from sewage, industrial effluents and solid waste are also dumped into these lakes. In some circumstances, this can cause the formation of foam. Foam in both Bellandur and Varthur lakes usually form during the pre-monsoon and monsoon season, when there are heavy…

Bengaluru, once known as the 'City of Lakes', has made national and international headlines as the 'City of Burning Lakes'. Lakes in Bengaluru have caught fire several times - mostly at Bellandur lake, but also in other parts of the city. The fire burns for hours, polluting the air with smoke and creating a public health hazard. Bellandur Lake, the city’s largest lake, has burst into flames many times in the recent past. The first instance was in May 2015, and then again in August 2016, February 2017, and January 2018. The 2018 fire lasted 30 hours, with smoke engulfing…