Glossary of Water and Wastewater Terms

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5 random terms from our glossary

gauge pressure

The pressure within a closed container or pipe as measured with a gauge. In contrast, absolute pressure is the sum of atmospheric pressure (14.7 lbs/sq in (1.0 atm) plus pressure within a vessel (as measured with a gauge). Most pressure gauges read in gauge pressure or psig (pounds per square inch gauge pressure) or kilopascals (kPa).

clear zone

See supernatant.

pretreatment facility

Industrial wastewater treatment plant consisting of one or more treatment devices designed to remove sufficient pollutants from wastewaters to allow an industry to comply with effluent limits established by the US EPA General and Categorical Pretreatment Regulations or locally derived prohibited discharge requirements and local effluent limits. Compliance with effluent limits allows for a legal discharge to a POTW.

equivalent weight

That weight that will react with, displace, or is equivalent to one gram of hydrogen.

protruding service

The connection of a building lateral to a main sewer line whereby a hole is cut in the main and the end of the building lateral is allowed to extend into the main.