Glossary of Water and Wastewater Terms

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5 random terms from our glossary

Water Table

The upper surface of the zone of saturation of groundwater in an unconfined aquifer.

Grinder Pump

A small, submersible, centrifugal pump with an impeller, designed to grind solids into small pieces before they enter the collection system.


A condition that occurs in tanks or basins when some of the flowing water entering a tank or basin flows along a nearly direct pathway from the inlet to the outlet. This is usually undesirable because it may result in shorter contact, reaction, or settling times in comparison with the theoretical (calculated) or presumed detention times.


The electrical pressure available to cause a flow of current (amperage) when an electric circuit is closed. Also called electromotive force (EMF).

Logarithmic Scale (log-uh-rith-mick)

A scale on which actual distances from the origin are proportional to the logarithms of the corresponding scale numbers rather than to the numbers themselves. A logarithmic scale has the numbers getting bigger as the distances between the numbers decrease.