At first glance, Marina Barrage may look like a giant rooftop park made for picnics, kite-flying and sweeping photographs of the Singapore skyline. Beneath that beautiful green roof, however, lies one of Singapore’s most important pieces of water infrastructure.
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Officially opened on 31 October 2008, Marina Barrage was built across the mouth of the Marina Channel. By separating the Marina Basin from the sea, it created Marina Reservoir—Singapore’s 15th reservoir. The project serves three purposes: supplying water, controlling floods and providing a recreational destination for the public.
During heavy rain, nine crest gates can be opened to discharge excess stormwater into the sea when the tide is low. When the sea level is too high for this to happen naturally, powerful pumps help move the water out. This protects low-lying areas such as Chinatown, Boat Quay, Jalan Besar and Geylang from flooding.
Marina Barrage also represents Singapore’s long journey towards greater water security. With limited land and no large natural lakes, Singapore traditionally depended heavily on imported water from Johor. Under the 1962 Water Agreement, Singapore may draw up to 250 million gallons of raw water daily from the Johor River until 2061. Singapore, in return, supplies Johor with treated water of up to 2% of the amount imported.
Rather than relying on just one source, PUB developed Singapore’s Four National Taps: local catchment water, imported water, NEWater and desalinated water. Rain falling over about two-thirds of Singapore’s land area is channelled through drains, canals and rivers into 17 reservoirs.
Used water is not simply thrown away either. After being collected and treated, part of it undergoes advanced purification to become NEWater, an ultra-clean, high-grade reclaimed water supply. Seawater can also be processed through reverse osmosis to produce desalinated drinking water.
Behind every turn of the tap, PUB manages the entire water loop—from collection and treatment to supply, recycling and flood protection. Water quality must be carefully monitored and treated before it reaches homes and businesses.
So, the next time we enjoy the breezy lawn at Marina Barrage or leave the tap running while washing dishes, remember: Singapore’s water security was built through decades of planning, technology and determination. Every drop has travelled a remarkable journey—let us not waste it.
