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

5 random terms from our glossary

initial backfill

Backfill extending from the springline or horizontal centerline of a pipe to a point above the top of the pipe. This zone provides some pipe support and helps to prevent damage to the pipe during placement of the final backfill. Also see backfill and final backfill.

wire-to-water efficiency

The combined efficiency of a pump and motor together. Also called the overall efficiency.

service connection

See lateral.

hydrogen sulfide gas (H2S)

A gas with a rotten egg odor that is produced under anaerobic conditions. Hydrogen sulfide gas is particularly dangerous because it dulls the sense of smell, becoming unnoticeable after you have been around it for a while; in high concentrations, it is only noticeable for a very short time before it dulls the sense of smell. The gas is very poisonous to the respiratory system, explosive, flammable, colorless, and heavier than air.

shoring

Material such as boards, planks or plates, and hydraulic jacks used to hold back soil around trenches and to protect workers in a trench from cave-ins. Also see sheeting.