The following is a list of service reservoirs in Singapore. There are currently 9 service reservoirs operating in Singapore which are used to store potable water. Changi Creek Reservoir Changi Creek Reservoir is a small service reservoir located to the north of Singapore Changi Airport in Singapore. The reservoir supplements and provides backup water supply for the airport. It was formed by damming the headwaters of a small river, Changi Creek, which empties into Sungei Changi and thence into the Serangoon Harbour. Rainfall from the runways and surrounding green areas is collected in the nearby South End Reservoir. Changi Creek Reservoir is used to balance flows during incoming tides and high rainfall. Fort Canning Service Reservoir The Fort Canning Service Reservoir (Chinese: 福康宁备水池) is an underground reservoir located on top of Fort Canning Hill in Singapore. Construction of the reservoir began on 1 April 1927 on the former site of a large artillery barracks and parade ground to help supplement the large impounding reservoirs. The reservoir was constructed in two sections, the southern section was ready for water storage by 1 August 1928, and the final work completed by the middle of January 1929. Water is pumped from the large reservoirs into the service reservoirs, thus enabling water to flow down the hill into houses. Earlier service reservoirs were built on Mount Emily (1878), Pearl's Hill (1903), and Bukit Timah Hill. The size of the Fort Canning Reservoir is 30 million gallons. A spring used to exist on the west side of Fort Canning Hill and served as a source of water in the early days of Singapore. The spring was called pancur larangan or "forbidden spring", where the women of the ruler's household were said to bathe in ancient times. In the early period of the 19th century Singapore, the stream was used to provide clean drinking water for all ships stopping at the port until the demand exceeded the capacity by the 1830, and the spring then dried up as wells were dug around the hill. A cache of Javanese-style gold ornaments dating to the mid-14th century were discovered when workers were excavating for the reservoir at Fort Canning in 1928. Jalan Eunos Service Reservoir Jalan Eunos Service Reservoir is a service reservoir located along Kaki Bukit Avenue 4 in Singapore. It is found in the northern part of Kaki Bukit estate near the Paya Lebar Air Base