Glossary of Aquatic Terms » T

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Solids that are less than size of two micrometer, very often nutrients form runoff. High dissolved solids may cause irrigation water to stain vehicles and other surfaces in the general vicinity. Water with dissolved solids is often referred to as being 'hard'


Amount of solid particles that are suspended in water and that cause light rays shining through the water to scatter. Thus, turbidity makes the water cloudy or even opaque in extreme cases. Turbidity is measured in nephelometric turbidity units (NTU). Lack of clarity, muddy, cloudy - in natural waters it is caused by the presence of suspended solids such as silt, clay, fine organic and inorganic matter, plankton and other microscopic organisms.