Permeable surfaces

Background

Permeable pavements infiltrate, treat, and/or store rainwater where it falls. They can be made of pervious concrete, porous asphalt, or permeable interlocking pavers. Permeable pavements can also reduce construction costs for residential and commercial development by reducing the need for some conventional drainage features.

Requirements and certification

Pervious surfaces shall be awarded points when installed in place of impervious materials or irrigated areas.

(Pervious surface area ÷ total landscaped area) × available points

The Inspector will confirm this practice with documentation from the applicant of the nature of the GSI infrastructure. The inspector shall seek point award from the program administrator. Points will be awarded based on the percent of traditional impervious surface that is replaced with permeable surface.