About the ADS Water Quality Unit & Infiltration System
General Information Performance Data Water Quality Treatment Process Design

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Water Quality Treatment Process

1. Runoff flows into the water quality treatment unit (WQU), which provides pretreatment through the physical settling of coarse particles in a large, baffled sedimentation chamber.

2. Floatables and trash are detained by an inverted weir in front of the outlet that leads to the IU.

3. Additional particle settling occurs in the infiltration chamber, creating a filter cake. Over time, filter cake and deposited sediment will build up and require removal.

4. As stormwater permeates the infiltration bed in the infiltration unit (IU), the contaminants it contains are both physically filtered by sand particles and chemically sorbed to particle surfaces.

5. In appropriate soils, water infiltrates. If the system is lined, perforated subdrains carry the treated runoff to the surface.