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The South End Reservoir is a small service reservoir located to the south of Singapore Changi Airport in Singapore. Rainfall from the runways and surrounding green areas is collected in the reservoir and used for fire-fighting drills and toilet flushing. The reservoir supplies 28–33% of the airport's water and saves the airport around S$390,000 per year. It is linked to the Changi Creek Reservoir to balance flows during incoming tides and high rainfall.
Map of South End Reservoir, Singapore
References
South End Reservoir Wikipedia(Text) CC BY-SA