Nestled within the verdant expanse of Sanjay Gandhi National Park in northern Mumbai, Tulsi Lake stands as a vital freshwater reservoir and a serene ecological retreat. As one of the three prominent lakes on Salsette Island alongside Powai Lake and Vihar Lake Tulsi Lake plays a crucial role in Mumbai’s water supply system while also serving as a sanctuary for wildlife and nature enthusiasts.
Location and Importance
Tulsi
Lake is located in Maharashtra, specifically in the northern region of Mumbai.
It lies within the protected boundaries of Sanjay Gandhi National Park, also
known as Borivali National Park (BNP), which is one of Asia’s most significant
urban green spaces. The lake is the second largest in Mumbai, following Vihar
Lake, and is characterized by its freshwater composition.
Its
primary function is to supply potable water to the southern parts of Mumbai.
Managed jointly by the Brihanmumbai Municipal Corporation (BMC) and the Sanjay
Gandhi National Park Authority, Tulsi Lake is a critical
component of the city’s water infrastructure. The lake’s pristine catchment and
regulated access ensure the quality of water remains high, making it a
dependable source for urban consumption.
Historical Background
The idea
of constructing Tulsi Lake was conceived in 1872, and the project reached
completion in 1897. The lake was formed by damming the River Tasso, whose flow
was redirected to the nearby Vihar Lake. Tulsi Lake was originally designed as
a backup reservoir to support Vihar Lake, especially during periods of high
demand or low rainfall.
This
strategic planning reflects the foresight of colonial engineers who recognized
the growing needs of Mumbai’s population and the importance of sustainable
water management. Over a century later, Tulsi Lake continues to fulfil its
intended purpose, underscoring its enduring relevance.
Geography and Hydrography
Tulsi
Lake’s catchment area spans approximately 6.76 square kilometers (2.61 square
miles), with the highest hill in the region rising to about 400 meters. The
lake itself covers a surface area of 1.35 square kilometers (135 hectares) and
has an average depth of 12 meters.
At full
supply level (FSL), the lake boasts a gross storage capacity of 2,294 million
imperial gallons (10,430,000 cubic meters). It supplies around 4 million
imperial gallons (18,000 cubic meters) of water daily to Greater Mumbai. The
highest recorded overflow level at the dam is 139.17 meters (456.6 feet).
Tulsi
Lake is heavily influenced by the southwest monsoon, which typically arrives in
mid-June and lasts until September. The region receives an average annual
rainfall of about 2,500 mm, with July and August being the wettest months.
Rainwater from the Powai-Kanheri hill ranges, covering a catchment of 676
hectares, feeds the lake. During heavy rains, excess water flows into Powai
Lake and eventually into the Mithi River.
Ecology and Biodiversity
The lake
is surrounded by thick, moist deciduous vegetation that thrives on the hilly
slopes of the national park. This undisturbed forest cover plays a vital role
in maintaining the ecological balance and water quality of the lake.
Tulsi
Lake is home to a variety of flora and fauna, most notably the freshwater
crocodiles known as Mugger or Marsh crocodiles. These reptiles have found a sustainable
habitat in the lake, and their presence adds to the ecological richness of the
area. The surrounding forest also supports numerous bird species, including
migratory birds, making it a hotspot for birdwatchers and wildlife enthusiasts.
Tourism and Conservation
Tulsi Lake is a Hidden Gem
for nature lovers and eco-tourists. Its location within Sanjay Gandhi National
Park makes it an ideal destination for those seeking tranquility and a close
encounter with nature. The presence of crocodiles in the lake led park
authorities to establish a dedicated crocodile park, enhancing the educational
and conservation value of the site.
Visitors
can enjoy guided nature walks, birdwatching, and photography, all while
learning about the lake’s ecological significance. However, due to its
protected status and the presence of wildlife, access to Tulsi Lake is
regulated. Entry permits are required and can be obtained from the park
authorities.
How to Get There
Tulsi
Lake is well-connected by various modes of transport:
- Nearest Airport: Sahar International
Airport, approximately 20 km away.
- Nearest Railway Station: Borivali East on the
Western Railways, about 6 km from the lake.
- From CST: The lake is around 38 km
from Chhatrapati Shivaji Terminus (CST), Mumbai’s historic railway
station.
The best
time to visit Tulsi Lake is during the monsoon season, when the landscape is
lush and the lake is brimming with water. The rains also bring out the vibrancy
of the forest and increase the chances of spotting wildlife.
A Model of Urban Sustainability
Tulsi
Lake exemplifies the delicate balance between urban development and
environmental conservation. As Mumbai continues to grow, the lake remains a
testament to the city’s commitment to preserving natural resources and
biodiversity. Its integration into the Sanjay Gandhi National Park ensures that
it is not only a source of water but also a living ecosystem that supports
countless species.