This was the second highest total rainfall recorded in a day for the first half of November 2020. According to the Meteorological Service Singapore, the highest daily total rainfall recorded that day was 100.2 mm at Tanjong Katong. The most recent flash flood event, in 2020, occurred on 7 November, when heavy rain overwhelmed the roadside drains along Aljunied Road, causing runoff to accumulate on the road for about 20 minutes. The list of flood-prone areas in Singapore can be found at In 2020, there were seven days when flash floods occurred at various locations in Singapore due to very intense rainfall within a short period of time.
Flash floods may occur if the rainstorms temporarily overwhelm the capacity of the drainage system, especially in low-lying areas that are more prone to flooding. The wet phase of the Northeast Monsoon in the region typically brings about heavy rainstorms more frequently. In September 2020, PUB purchased 20 pieces of Floodgates from UK-based Floodgate Limited, for performance testing and validation, with 15 pieces currently on loan to residents at Upper Paya Lebar Road for the monsoon season. Floodgates can be used for wider openings such as the entrances of shopfronts, as units can be linked together to create longer sections. Designed to hold back floodwaters as high as 680 mm, each Floodgate can be deployed by one person within minutes and packed away easily when not in use. They are available in different sizes to suit apertures with widths ranging from 770 mm to 1520 mm, and weigh between 13 kg to 21 kg, depending on their size. The side panels of the Floodgate barriers can be extended with a wrench to achieve a watertight seal against the doorway. Floodgate is made from high-strength steel frames, wrapped in a waterproof rubber sleeve. PUB, Singapore’s National Water Agency, is adding a new flood protection device, Floodgate, to its suite of flood barriers that can be deployed quickly to protect homes and buildings in the event of flash floods, caused by heavy rainstorms during the monsoon season.
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