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The Marina Barrage project was awarded to Koh Brothers Building & Civil Engineering Contractor Pte Ltd in early 2005. The Marina Barrage is a dam built across the Marina Channel to create a freshwater reservoir. Officially opened on 31 October 2008, it is Singapore's first urban freshwater reservoir – at 10,000ha, or one-sixth of Singapore land size – to provide desalinated water to meet the country's growing demand.
Koh Brothers designed the barrage using a system comprising gates and pumps. It has nine steel crest gates spanning the 350m-wide Marina Channel, and seven drainage pumps capable of displacing a combined total of 280 cubic metres of water per second. With this system, the barrage alleviates flooding in low-lying areas in the city including Chinatown, Jalan Besar and Geylang.
On 6 May 2009, The Marina Barrage was conferred the Superior Achievement Award - the highest honour for the best project entry - at the American Academy of Environmental Engineers Annual Awards, becoming the second project outside of USA to win the award in the last decade.