A porous concrete called Topmix Permeable may be the answer to reducing flash flooding in urban areas, as well as significantly reduce the amount of standing water on sidewalks, parking lots, bike paths, roads and more in rainy weather. Created by Tarmac, the porous concrete surface can absorb up to 880 gallons of water. The way the concrete surface works is that a layer of rocks and pebbles is set down, then the porous material is set on top. When rainwater hits the surface, it flows down … [Read more...]