Bioretention: Partial infiltration

Partially infiltrating bioretention with underdrain.

Partially infiltrating bioretention with anaerobic/aerobic storage zone.

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.

Performance

Materials

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

Research

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

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.