Glossary of Water and Wastewater Terms

A B C D E F G H I J K L M N O P Q R S T U V W Y Z Symbols and Numbers

5 random terms from our glossary


A flat is the length of one side of a nut.

Alluvial Deposit (uh-LOO-vee-ul)

Sediment (clay, silt, sand, gravel) deposited in place by the action of running water.

Thief Hole

A digester sampling well that allows sampling of the digester contents without venting digester gas.




  1. The base on which an organism lives. The soil is the substrate of most seed plants; rocks, soil, water, or other plants or animals are substrates for other organisms.
  2. Chemical used by an organism to support growth. The organic matter in wastewater is a substrate for the organisms in activated sludge.