Bioretention: Partial infiltration

Bioretention cell schematic depicting partial infiltration capturing and treating runoff from the surrounding parking lot, while also allowing excess water to leave the site via perforated underdrain and overflow pipes. For more standardized details click here for the Design Criteria for Green Infrastructure in the Right-of-Way document A note: The following is an "image map", feel free to explore the image with your cursor and click on highlighted labels that appear to take you to corresponding pages on the Wiki.

Overview

Over soils with slow infiltration rates, it is advantageous to drain a portion of the stored water prior to any upcoming storm. This popular design choice can optimize annual water balance, mitigate peak flow rates and by ensuring water flow through, can reduce the accumulation of sodium and chlorine ions from winter salting.

Partially infiltrating bioretention with underdrain.

Partially infiltrating bioretention with anaerobic/aerobic storage zone.

Materials

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

Research

Back to Bioretention

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

The portion of water precipitated onto a catchment area, which then flows as surface discharge from the catchment area past a specified point.

Water from rain, snow melt, or irrigation that flows over the land surface.

A perforated pipe used to assist the draining of soils.

The accounting of inflow and outflow of water in a system according to the components of the hydrologic cycle.

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