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

Capillary Fringe (KAP-uh-larry)

The porous material just above the water table that may hold water by capillarity (a property of surface tension that draws water upward) in the smaller void spaces.

Pilot-Scale Study

A method of studying different ways of treating water or wastewater and solids or to obtain design criteria on a small scale in the field.

Foundation

The material in the bottom of a trench. It may or may not have a layer of bedding soil placed over it. The foundation soil may be (1) undisturbed and remain in place; (2) unsuitable and must be removed and replaced with another material; (3) so wet and soft that it must be displaced by dumping rock into the trench; or (4) removed from the trench, placed back in the trench, and then compacted. Over-excavation and backfill of the foundation is required only when the native trench bottom does not provide a firm working platform for placement of the pipe bedding material.

Agglomeration (uh-glom-er-A-shun)

The growing or coming together of small scattered particles into larger flocs or particles, which settle rapidly. Also see FLOC.

Fit Test

The use of a procedure to qualitatively or quantitatively evaluate the fit of a respirator on an individual. A qualitative fit test (QLFT) is a pass/fail test to assess the adequacy of respirator fit that relies on the individual’s response to the test agent. A quantitative fit test (QNFT) is an assessment of the adequacy of respirator fit by numerically measuring the amount of leakage into the respirator.