North American Society for Trenchless Technology

Glossary of Terms
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Term	Definition
Valve	Mechanism that controls the volume or direction of flow Can be closed, partially open, or fully open.
VCP	Vitrified Clay Pipe
VCT	Vitrified Clay Tile or Vitrified Clay Tile Pipe
Velocity Head	For water moving at a given velocity, the equivalent head through which it would have to fall by gravity to acquire the same velocity.
Virgin soils	Soils which have not previously been excavated.
Voids	(1) Holes on the outside of the pipe in the surrounding soil or material. (2) A term generally applied to paints to describe holidays, holes, and skips in the film. Also used to describe shrinkage in castings or welds.
Volume	The amount of drilling fluid flow.

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