Serangoon Reservoir, Singapore
Serangoon Reservoir is a freshwater reservoir in northeastern Singapore formed by damming the lower reaches of the Serangoon River and enclosing part of the Punggol–Serangoon estuarine system. The reservoir is managed by PUB, Singapore’s national water agency, and serves multiple functions: augmenting local water supply, providing flood control, supporting biodiversity, and offering recreational waterfront spaces for neighbouring communities. The engineering works that enabled the reservoir’s creation include the construction of barrages and associated tidal gates — most notably the structures collectively referred to in later pages as the Serangoon Barrage. 1
Overview and Purpose
The primary purpose of Serangoon Reservoir is to increase Singapore’s local catchment — one of the components of the nation’s Four National Taps water strategy — by converting previously tidal waterways into freshwater storage. The reservoir collects rainwater from the surrounding catchment, including parts of Sengkang, Punggol, Hougang and Ang Mo Kio, and contributes to Singapore’s overall water security. Its creation also improves flood resilience in the north-eastern corridor by regulating tidal and stormwater flows. 2
How the Reservoir Was Formed
Serangoon Reservoir was formed when PUB dammed and closed off the estuarine mouths of the Serangoon and Punggol rivers as part of the Punggol–Serangoon Reservoir Scheme, completed in 2011. The damming involved construction of barrages and gates at strategic locations near the river mouths to prevent seawater intrusion while allowing controlled discharge during heavy rainfall. The enclosure converted the tidal waterways into freshwater bodies that could be managed and harvested for potable water after treatment. 3
Key Infrastructure and Water Management
The reservoir system includes the barrage/tidal-gate structures, connecting canals, cut-off walls and pumping facilities that regulate water levels and quality. One specialised safeguard at Lorong Halus and nearby areas was the design and installation of cut-off walls and leachate-control measures to protect the reservoir from contaminants originating from a former landfill site — today’s Lorong Halus Wetland — adjacent to the reservoir’s eastern bank. These measures were important to ensure the water meets treatment standards and to protect aquatic habitats. 4
Catchment, Size and Hydrology
The Serangoon Reservoir forms part of a larger catchment network that, together with Punggol Reservoir and Marina Reservoir, expanded Singapore’s local catchment area substantially when completed. The reservoir’s surface area and storage volume are modest compared with larger global reservoirs, but they are significant for Singapore’s compact geography. The enclosed reservoir receives runoff from adjacent urban estates and park catchments, and its hydrology is actively managed to balance storage, water quality and flood mitigation. 5
Ecology and Habitat Restoration
Converting the tidal river to a freshwater reservoir did not mean the end of ecological value. On the contrary, carefully planned restoration and wetland creation — including the Lorong Halus Wetland and other vegetated buffers — have established habitats for birds, fish and other fauna. Features such as mangrove fragments, reedbeds and vegetated swales help filter runoff and provide habitat niches. The wetland at Lorong Halus, built on a rehabilitated landfill site, also serves as a demonstration of how engineered nature can protect water quality while enhancing biodiversity. 4
Recreation and Community Use
Serangoon Reservoir is integrated with the Park Connector Network (PCN) and a series of promenades, viewing decks and parks that encourage public use. Popular activities in and around the reservoir include jogging, cycling, birdwatching and photography. The waterfront promenades and park connectors link to nearby Punggol Waterway Park and other leisure spaces, creating long continuous green corridors for residents. Community spaces and viewing platforms allow passive recreation while preserving buffer zones for wildlife. 1
Water Quality and Treatment
Water from the reservoir is not supplied directly to households; it is treated in PUB’s waterworks before distribution. Maintaining water quality in a catchment-heavy urban environment requires multiple layers of protection: source-control wetlands, sediment traps, vegetative buffers, and public education to minimise pollutant inputs. PUB’s monitoring programmes track biochemical oxygen demand, nutrient levels and turbidity to ensure that treatment plants can effectively produce safe drinking water.
Flood Control and Climate Resilience
In addition to storage for water supply, the Serangoon Reservoir plays a role in flood management. The barrages and sluice-gate systems allow controlled release of excess stormwater to the sea at appropriate times, reducing the risk of urban flooding in the adjacent towns. As Singapore adapts to more intense rainfall and sea-level rise, reservoirs and coastal control structures continue to be important elements of the city-state’s climate resilience strategy. 2
Access and Visiting
The reservoir is accessible via multiple park connectors and nearby MRT and bus corridors serving Sengkang and Punggol. Visitors can enjoy scenic stretches along the Punggol Promenade and the Woodlands–Punggol–Serangoon connector routes. Viewing decks and interpretive panels at sites such as Lorong Halus provide educational context about the reservoir’s history, engineering and ecological features. Please check PUB and NParks for the latest access advisories and event information. 1
Ongoing Works and Future Plans
Singapore’s water agencies periodically review and upgrade reservoir safeguards, riparian enhancement and public amenities. Plans under national sustainability agendas focus on expanding nature-based solutions, enhancing biodiversity corridors and improving stormwater management to cope with urbanisation and climate change. Continued community engagement and stewardship programmes are expected to keep the Serangoon Reservoir both ecologically resilient and publicly beneficial. 3
Serangoon Reservoir is 
on the Map of Reservoirs in Singapore
References
- PUB – Serangoon Reservoir (Places of Interest)
- PUB – Water from Local Catchment / Our Water Story
- List of dams and reservoirs in Singapore – Wikipedia
- URA / Media Release – Lorong Halus and Serangoon Reservoir works (2011)
- NLB – Lorong Halus Wetland (history and features)
Page Details
This page was created on 5 October 2025. Hi, my name is Timothy and created it from my research, for my own entertainment, knowledge and to satisfy my curiosity. I am providing the information to you in good faith and hope it is useful. I try to get the details as accurate as possible. I also try to update the page whenever I stumble on new details. So this and all my other pages are perpetual work in progress. If you discover any error, please politely inform me, pointing out where the error lies, and I will correct it as soon as possible. Your helpfulness will keep this page accurate, relevant and helpful to those who need the information.List of Reservoirs in Singapore
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