The overflowing of Tulsi Lake in Mumbai, the smallest among the seven lakes supplying water to the city, was officially reported due to the continuous heavy rainfall affecting both the city and its catchment areas. On July 8, the Brihanmumbai Municipal Corporation (BMC) announced that this overflow occurred on Tuesday night, shortly after Vihar Lake began overflowing at 9:00 PM on the same day. Both lakes are the only ones located within BMC jurisdiction, highlighting their importance in the region’s water supply.

According to the BMC’s Water Engineering Department, the timing of these overflows is notably earlier than in previous years. For instance, in 2025, Tulsi Lake reached its capacity on August 16, while it overflowed on August 4 in 2024. This year’s overflow signifies the impact of the prevailing weather conditions, as the monsoon season has commenced vigorously.

The combined water stock of all seven lakes that supply water to Mumbai stands at 41.43 per cent of their total storage capacity, despite the overflow from Tulsi and Vihar Lakes. This indicates a significant level of water availability, which is vital for the city amidst the seasonal rains.

Details of Tulsi Lake

Tulsi Lake, constructed in 1879 at an estimated cost of Rs 40 lakh, has been an essential part of Mumbai’s water supply framework. With a live storage capacity of 8.046 billion litres, it contributes around 18 million litres (1.8 crore litres) of water daily to the metropolis. Located approximately 35 kilometres from the BMC Headquarters, the lake has a catchment area of about 6.76 square kilometres.

The area covered by the lake when full spans approximately 1.35 square kilometres. Overflow from Tulsi Lake is directed into Vihar Lake, demonstrating a connection between these two water bodies and their roles in supplying water to Mumbai.

Monitoring and managing the water levels of these lakes is crucial during the monsoon season for the population relying on this resource. BMC continually assesses the situation to ensure a stable water supply.

Weather Forecast and Implications

Winds are predicted to reach speeds of 60 to 70 km/h across parts of the Konkan region. Furthermore, the IMD has informed residents that the intensity of rainfall will likely decrease after July 9. Areas like Ratnagiri and Sindhudurg may also face heavy rainfall in isolated spots.

Officials have alerted the public about the potential for localised flooding and flash floods, particularly in low-lying areas. Disruptions to various modes of transport—road, rail, air, and ferry services—are also anticipated due to the severe weather. It is advisable for individuals to steer clear of waterlogged zones, verify traffic conditions prior to travel, and exercise caution during thunderstorms.

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