“One of these things is not like the other,” Ernie from Sesame Street said it best.  For those that claim impervious surfaces, such as asphalt and concrete, and pervious surfaces are synonymous, that is not true.  Bay Area Pervious Concrete’s David Liguori went out on the field this week to report on some real-time comparisons between these two surfaces during our most recent storm, and the evidence is striking.