Biofilters

Bioretention without infiltration

Overview

Over subsurface infrastructure, soils prone to subsidence, or pollution hotspots, it may be necessary to prevent all infiltration. These BMPs can also be squeezed into tight urban spaces, adjacent to buildings and within the usual setbacks required for infiltrating facilities.

Materials

Bioretention planters are often fitted into tight spaces within highly urbanized contexts. In these cases the cell may be constructed of concrete. This can be further waterproofed/have added resiliency from the application of a liquid sealant. Alternatively, a liner may be used.

• Underdrain
• Biomedia
• Erosion control
• Mulch
• Planting considerations and Recommended species

Performance

Back to bioretention

A shallow excavated surface depression containing prepared filter media, mulch, and planted with selected vegetation.

The slow movement of water into or through a soil or drainage system.

Penetration of water through the ground surface.