Surface flow system is designed system with surface water exposed to air. In groundwater flow system, the water level is lower than the fixed surface material.
All kinds of filtering wetlands park are planted at least one kind of plant with roots in a certain type of material ( usually the soil, gravel or sand). The pollutants are reduced thanks to the coordination of the process chemistry, physiology, biology, sedimentation, precipitation and absorption into the soil, the process of assimilation by plants and metabolism by the bacteria
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