NUS conducts study on permeable road surface [News]
By Monica Kotwani, Channel NewsAsia, 7 Jul 2013.
Porous surfaces could be another means of controlling flash flooding in Singapore.
For instance, concrete slabs with hole in neighbourhood carparks is among the many methods adopted by urbanised countries like Singapore to mitigate flooding after heavy rains. The little grass patches in them absorb rainwater.
Channel NewsAsia understood the National University of Singapore has been studying the concept of permeable surfaces for minor roads and pavements in a bid to slow down the flow of water into drains after heavy rainfall.
When it rains, the water will be absorbed through a layer of porous concrete and flow through a layer of gravel to store water temporarily.
The gravel has about 30 to 40 per cent space in between to store water.
An overflow channel will drain water from the gravel layer during heavy storms or long periods of rain.
Below the gravel, a layer of geotextiles, or permeable fabrics, filters the water further into the ground.
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Source: Channel NewsAsia