Pervious concrete is a porous pavement that can quickly drain stormwater, saving lives and property from flash floods. Air gaps allow water to flow through into soil, replenishing ground water. Storm sewers receive less volume and road surface runoff. Dan Clark tells of an improvement by a U.K. company and compares the new product with the currently-available products. More:  https://www.thesafetybrief.com/pervious-concrete-gulps-stormwater/