408.2.4 Pervious Pavement and Permeable Unit Pavement

Pervious pavement and permeable unit pavement including open grid paving systems and open-graded aggregate systems shall have an infiltration rate not less than 2 gallons per minute per square foot (100 L/min × m²). The infiltration rate for pervious pavement shall be determined by testing in accordance with ASTM C1701/C1701M. The infiltration rate for permeable unit pavement shall be determined by testing in accordance with ASTM C1781/C1781M. Pervious pavement and permeable unit pavement shall be permitted where the use of these types of hardscapes does not interfere with fire and emergency apparatus or vehicle or personnel access and egress, utilities, or telecommunications lines. Aggregate used shall be open-graded to allow the pavement to comply with the infiltration rate.