Glossary of Water and Wastewater Terms

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5 random terms from our glossary

Laminar

Laminar flow is smooth or viscous flow; not turbulent flow.

Flotation

  1. The stress or forces on a pipeline or manhole structure located below a water table that tend to lift or float the pipeline or manhole structure.
  2. The process of raising suspended matter to the surface of the liquid in a tank where it forms a scum layer that can be removed by skimming. The suspended matter is raised by aeration, the evolution of gas, the use of chemicals, electrolysis, heat, or bacterial decomposition.

SIC Code

Standard Industrial Classification code. A code number system used to identify various types of industries. In 1997, the United States and Canada replaced the SIC code system with the North American Industry Classification System (NAICS); Mexico adopted the NAICS in 1998. Also see NAICS.

Explosimeter

An instrument used to detect explosive atmospheres. When the lower explosive limit (LEL) of an atmosphere is exceeded, an alarm signal on the instrument is activated. Also called a combustible gas detector.

Hydraulic Gradient

The slope of the hydraulic grade line. This is the slope of the water surface in an open channel, the slope of the water surface of the groundwater table, or the slope of the water pressure for pipes under pressure.