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This Water-Absorbing Concrete Could Prevent Flooding

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Watching this permeable concrete from Tarmac absorb 4,000 liters of water in 60 seconds is mesmerizing—it looks like the water is just disappearing. In reality, it is soaking through the concrete's surface layer of relatively large pebbles, through the 'attenuation layer,' and into a drainage system that brings it back to the city's groundwater reservoirs. The concrete can be used to mitigate flooding, but only in temperate areas—once temperatures drop below freezing, the entire system is destroyed.
· Watch: This new 'thirsty' concrete absorbs 4,000 litres of water in 60 seconds [Science Alert, via Archinect]