Capillary Action
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Capillary action is a manifestation of surface tension by which the portion of the surface of a liquid coming into contact with a solid is elevated or depressed depending on the adhesive or cohesive properties of the liquid.


 
Critical Velocity
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Critical velocity in storm water is the speed at which run off causes deformation or erosion to existing structures or channels.


Gravity
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A mutual physical force attracting two bodies.  Gravitational water is not held by capillary action in soil and percolates downward by the force of gravity.  


Introduction
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Storm water is a widespread problem.  Storm water carries contaminants from sites into the collection systems.  These contaminants enter water supplies, create turbidity, and increase bacterial contamination.  Storm water dilutes the concentration of food in treatment plants, causing problems with microbes, and can overwhelm plants and cause excessive discharge.

Storm Water
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Storm water includes water running off roofs, streets, and other surfaces.


Treatment
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If storm water becomes mixed with sewage, the mixture will be treated using typical wastewater processes. Unmixed stormwater only requires treatment in a few cases.