About the Tree Box Filter
General Information Performance Data Water Quality Treatment Process Design


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Water Quality Treatment Process

1. Runoff flows into the tree filter basin from the street and passes into the filter media.

2. In the filter media, biological treatment occurs through the uptake of pollutants, such as nitrogen and petroleum hydrocarbons, by vegetation and soil microorganisms. Physical and chemical treatment also occurs within the soil media. Other treatment unit processes include sedimentation and sorption with organic matter and mineral complexes.

3. Filtered runoff is collected in a perforated subdrain and returned to a storm drain system, infiltrated into the subgrade, or discharged to the surface.