CHAPTER 12 – Soil Processes: Soil processes constitute a group of unit processes: sorption, biological removal, sedimentation, precipitation, and filtration. Distinction is made between saturated soils in wet ponds and wetlands, and unsaturated soils in vegetated swales and infiltration systems.

Some of the questions considered in Chapter 12

• Is it the soil or is it the vegetation that is the primary remover of dissolved pollutants?
• Is groundwater and soil quality at risk with infiltration systems?
• How may chemistry of soils vary, thereby affecting the performance of wet basins?
• Is the risk of anaerobiosis real in infiltration systems and is it beneficial under certain circumstances?
• What is the performance of porous pavements and pavers?
• Should soils in infiltration systems be specified?
• What is the expected performance of bioretention systems, both short and long term?

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