This system allows all water falling onto the pavement to permeate through the Topmix Permeable surface layer, pass through the lower pavement courses and into the sub- grade.
Some water may be retained within the pavement reservoir before permeating into the sub-grade.
Full infiltration systems do not discharge any additional water into traditional drainage systems.
Geotextiles may be incorporated into the system depending on the nature of the sub-grade.