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Tile Draining & Water Quality in Minnesota
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Foam on rivers can occur from a large amount of organic matter in the water and heavy turbulence from snowmelt.
Foam in rivers, lakes, and streams are often the result of natural processes, not necessarily environmental pollution. Foam can be formed when the physical characteristics of the water are altered by the presence of organic materials in the water. In the spring there is a higher level of organic matter in the water from the decomposition of plant material. When the plant matter decomposes, the oils in the plant cells are released and float to the surface where the turbulence of flowing water adds air into the organically enriched water which forms the bubbles.
Foam can also be caused by human activity such as high runoff of phosphates from detergents. Herbicides can contribute surfactants ( substances added to enhance adhesion) to runoff which can also add to the foaming.
The amount of foaming is influenced by several factors:
How can I tell if foam is from human activities?
Natural Foam
Foam from Human Activity