Knowledge Framework
Use Cases
- Operate flood defences during events — Decide when to close barriers, activate pumps, open sluices, or divert floodwater through emergen...
- Balance supply across multiple sources — Coordinate between reservoirs, groundwater, desalination, and recycled water to meet daily demand...
- Manage reservoir storage and releases — Decide how much water to store and how much to release from reservoirs, balancing supply security...
Decision Patterns
- Integrated flood systems — Combine infrastructure and monitoring
- Integrated water systems — Coordinate multiple supply sources
- Reservoir optimisation — Manage stored water effectively
System Models
Infrastructure & asset models
Tool: Gate and pump control systems — Manages 9 crest gates and 7 drainage pumps
Overview
The Marina Barrage is a 350-metre dam built across the Marina Channel in the heart of Singapore. It serves three purposes: creating a freshwater reservoir, providing flood control for the low-lying city centre, and creating a lifestyle and recreational attraction.
By damming the Marina Channel, the barrage converted the formerly tidal Marina Basin into Marina Reservoir — Singapore’s 15th and largest freshwater reservoir. The reservoir’s 10,000-hectare catchment (one-sixth of Singapore’s total land area) collects rainwater from the central urban area, contributing to the nation’s “First National Tap” of local catchment water.
The barrage also eliminates tidal influence from the basin, preventing tidal flooding that previously affected low-lying areas like Chinatown, Boat Quay, and Jalan Besar during high tides combined with heavy rain.
Timeline & Location
1987: Concept first proposed by Mr Lee Kuan Yew to dam the Marina Channel and create a freshwater reservoir. 2005: Construction begins. 2007: Nine crest gates installed. 2008: Marina Barrage officially opened on 1 November. 2010: Marina Reservoir water quality reaches potable standard. The barrage operates continuously, with automated pump and gate systems managing water levels 24/7.
Stakeholders
The Marina Barrage is owned and operated by PUB (Public Utilities Board), Singapore’s National Water Agency. The barrage was designed by Arup and constructed by a joint venture of Koh Brothers Group and Penta-Ocean Construction.
PUB operates the Sustainable Singapore Gallery within the barrage building, a public education facility showcasing Singapore’s water story and sustainability efforts. The gallery and rooftop green space attract over 1 million visitors annually.
Digitalisation & Data
The barrage operates with a fully automated SCADA control system managing its nine steel crest gates (each 30 metres wide) and seven drainage pumps. The system continuously monitors:
Water Level Management
Real-time monitoring of water levels on both the reservoir and sea sides. During heavy rain, the system automatically lowers the reservoir level by pumping excess water into the sea at low tide, or activating crest gates when the sea level is lower.
Water Quality Monitoring
Continuous sensors track salinity, turbidity, and contaminant levels in the reservoir to ensure water quality meets treatment standards for the local catchment supply.
Hazards
Exogenous Hazards
Sea level rise increasing the frequency and severity of tidal flooding events. Climate change intensifying rainfall events in the tropical catchment. Urban pollution from the 10,000-hectare catchment affecting reservoir water quality.
Endogenous Hazards
Maintaining water quality in an urban catchment with multiple pollution sources. Pump and gate system reliability for continuous flood protection operations.
Cost & Benefit
Cost: S$226 million (approximately US$170 million) construction cost. Ongoing operational costs for pump systems, gate maintenance, and water quality management.
Key Benefits: Created Singapore’s largest freshwater reservoir, increasing the nation’s water catchment from half to two-thirds of total land area. Eliminated tidal flooding in low-lying central areas. The Green Roof and Sustainable Singapore Gallery attract over 1 million visitors annually, creating a landmark lifestyle destination. The calm freshwater reservoir enables water sports and recreation.
Resilience Principles Assessment
Assessment of meeting Principles of Resilient Infrastructure
Proactively Protected (P2)
The barrage proactively protects low-lying central Singapore from tidal flooding through automated pump and gate systems that operate continuously. The freshwater reservoir diversifies water supply sources.
Environmentally Integrated (P3)
The barrage features one of Singapore’s largest green roofs and integrates water supply, flood control, and recreation in a single piece of infrastructure. The conversion from tidal to freshwater has created new ecological habitats.
Socially Engaged (P4)
The Sustainable Singapore Gallery and public green roof create a civic space that educates over 1 million visitors annually about Singapore’s water story. The reservoir supports community water sports and dragon boat racing.
Shared Responsibility (P5)
Government-led investment in multi-functional infrastructure that serves water supply, flood protection, and recreational needs simultaneously, distributing benefits across the entire population.
Continuously Learning (P1) To Do
Details pending.
Adaptively Transforming (P6) To Do
Details pending.
Futures
PUB continues to improve reservoir water quality through upstream catchment management, including the ABC (Active, Beautiful, Clean) Waters Programme which naturalises drains and canals feeding the reservoir. Climate change adaptation planning addresses the implications of sea level rise for barrage operations.