drain shaft

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• Well drain — Well Well, n. [OE. welle, AS. wella, wylla, from weallan to well up, surge, boil; akin to D. wel a spring or fountain. ????. See {Well}, v. i.] [1913 Webster] 1. An issue of water from the earth; a spring; a fountain. [1913 Webster] Begin, then,… …   The Collaborative International Dictionary of English

• vadose shaft —    A vertical tube in the vadose zone that may be a few inches to several feet in diameter and may be a few feet deep to hundreds and over a thousand of feet deep. They commonly occur as complexes. A drain hole is usually evident at their base.… …   Lexicon of Cave and Karst Terminology

• tunnels and underground excavations — ▪ engineering Introduction        Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …   Universalium

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