In keeping with its commitment to stay on the cutting edge of technological advances in the paving industry, Grimes Asphalt & Paving Corp. was the first to install porous asphalt in a parking lot in Iowa. Porous Asphalt allows rain to move through the asphalt and into a rock layer placed below the pavement. From there, the stormwater infiltrates slowly into the soil below, thereby replenishing groundwater and containing pollutants from reaching navigable waters.