Tulsi Lake

Tulsi Lake. It is a significant freshwater reservoir located within the protected bounds of the Sanjay Gandhi National Park in northern Mumbai. Constructed in the late 19th century, it serves as a crucial secondary water source for the metropolis, supplementing the supply from the larger Vihar Lake. The lake and its densely forested catchment area form a vital ecological zone within one of the world's most populous urban regions.

Geography and location

Tulsi Lake is situated in the northern suburbs of Mumbai, entirely encompassed by the verdant expanse of the Sanjay Gandhi National Park. It lies to the north of its larger counterpart, Vihar Lake, with both reservoirs nestled within the park's boundaries. The lake is surrounded by the undulating terrain of the Western Ghats, specifically within the Borivali region. Its catchment area is characterized by dense tropical forests, which play a critical role in water percolation and soil conservation. The location provides a stark contrast to the surrounding urban sprawl of the Mumbai Metropolitan Region.

History and construction

The construction of the lake was commissioned to address the growing water demands of the burgeoning city of Bombay during the British Raj. It was built across the Tasso River, a tributary of the Dahisar River, and was completed in 1897, a few years after the completion of Vihar Lake. The project was part of a series of hydraulic engineering initiatives undertaken by the Bombay Municipal Corporation to secure a reliable water supply. The dam and waterworks represent an important chapter in the colonial-era infrastructure development of the city, predating more modern systems like the Bhatsa Dam.

Hydrology and water supply

Tulsi Lake is a masonry gravity dam that impounds water primarily from its own forested catchment and seasonal rainfall. It has a relatively smaller storage capacity compared to major contemporary sources like the Upper Vaitarna Dam or the Middle Vaitarna Dam. The water is treated at nearby facilities and integrated into the municipal supply network managed by the Brihanmumbai Municipal Corporation. Along with Vihar Lake and Powai Lake, it forms part of a local system that supplements water brought from distant reservoirs in Thane district and beyond, helping to meet the needs of specific zones in Mumbai.

Flora and fauna

The immediate environs form a rich biodiversity hotspot within the Sanjay Gandhi National Park. The surrounding forests are predominantly moist deciduous, featuring species like teak and ain. The area provides habitat for a variety of mammalian species including the leopard, spotted deer, and the Indian flying fox. Herpetofauna such as the Indian rock python and the Checkered keelback are present. The lake itself attracts numerous aquatic and avian species, contributing to the park's status as an important green lung for the Mumbai Metropolitan Region.

Environmental concerns

Primary concerns include the risk of pollution from anthropogenic activities and the encroachment of urban development on the buffer zones of the Sanjay Gandhi National Park. As a protected water body, it faces threats from untreated waste and religious offerings, which can degrade water quality. Conservation efforts are managed by the Maharashtra Forest Department in coordination with the Brihanmumbai Municipal Corporation. The health of the lake is intrinsically linked to the preservation of its catchment forest, which is vital for maintaining the hydrological balance and supporting the diverse wildlife of the Western Ghats ecosystem.

Category:Lakes of Maharashtra Category:Reservoirs in India Category:Sanjay Gandhi National Park Category:Water supply infrastructure in Mumbai