Topmix: New permeable pavement that can absorb 4,000 litres of water a minute!

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Topmix: New permeable pavement

A new and improved variety of concrete developed in the U.K. called Topmix Permeable has been turning heads. The video shows a parking lot paved with Topmix absorbing 4,000 litres of water in a minute, and it’s kind of magical to watch it disappear. This new concrete, from Lafarge Tarmac, could potentially be a very useful tool in combating urban flash flooding from sudden, heavy storms—the type that are likely to become increasingly common because of climate change. This new product can potentially produce a solution to area’s where flash flooding are common during heavy rain in parts of Sydney and New South Wales. This innovative new product could be a game-changer for commercial projects like pavements in streets or car parks that are prone to flooding.

How it works

Unlike conventional concrete, it has a high void content of between 20-35%. This allows surface water to drain through into the sub-strata and dissipate naturally, reducing the risk of surface water flooding and watercourse contamination. This system allows all water falling onto the pavement to permeate through the TOPMIX PERMEABLE surface layer, pass through the lower pavement courses and into the sub-grade. Some water may be retained within the pavement reservoir before permeating into the sub-grade. Full infiltration systems do not discharge any additional water into traditional drainage systems. Geotextiles may be incorporated into the system depending on the nature of the sub-grade.