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…
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