Topmix can help rapidly remove water from roadways, preventing the potentially dangerous buildup of standing water.
As it is absorbed, stormwater is filtered through a porous layer of pebbles, removing petroleum hydrocarbons and other pollutants commonly found on roadways before the water is ultimately returned to the water table.
"Being able to control and actively manage the drainage of rainwater from the developed landscape significantly reduces the risk of surface water flooding, protecting both the natural and built environment," the company explains on its website.
Interestingly, Topmix can also help mitigate the urban Heat Island Effect: because of the pores within its structure, the pavement cannot retain as much heat as traditional asphalt. Furthermore, water evaporating from the pavement's pores can have a cooling effect on the immediate area.
The technology isn't quite ready for wide-scale deployment. Tarmac notes that the permeable surface is prone to damage from freezing water and therefore not suitable for use in subzero temperatures.
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Furthermore, the product is not suitable for use on high-volume roadways that bear heavy loads, although it can be used on shoulder lanes, residential streets, pedestrian and bike paths and parking lots.
via Tech Insider
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