perviousPervious concrete pavements are to help control stormwater runoff from the heavy showers in the Pacific Northwest. Pervious concrete is intentionally designed to contain more than 20 percent air voids in the mixture and allow for at least 500 inch/hr infiltration rate. Runoff travels through the pervious concrete slab, passes through the underlying stone reservoir and percolates into the natural subgrade soil or is collected by underdrains. The picture shows that as the water is being poured over a pervious concrete slab, it infiltrates through the slab. Like any other new products that become popular too quickly, pervious concrete pavements are falling behind in design and testing. We are working on material testing and design method development for pervious concrete with several entities such as the Washington state department of transportation (WSDOT), The Boeing Company, American Concrete Institute (ACI), Airport Cooperative Research Program (ACRP), and local University Transportation Centers.