Downspouts

Background

Typically, rain falls on a roof, flows through downspouts and over impervious surfaces, then travels into off-site stormwater treatment systems. The diversion of downspouts to pervious areas creates the following improvements:

1. Water that would be wasted as runoff is used to meet plant water needs.
2. Water that would typically run off and burden the stormwater system infiltrates the soil and is treated on-site.

Requirements and certification

Downspouts shall be directed to pervious areas onsite two feet or more from foundation.

Program tip

The inspector must visually confirm presence of gutters, partial or complete. Downspout extenders may be used to achieve credit.