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drainage well[′drān·ij ‚wel]
A vertical shaft in a masonry dam to intercept seepage before it reaches the downstream side.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
an installation for drying out one or several aquiferous horizons above the production level by allowing water to flow under the force of gravity into an aquiferous horizon under a mining excavation or deposit. Such wells are used to drain deposits of minerals, primarily in the preliminary drainage stage.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive
A single well drainage
system was used to control the negative methane extraction pressure at micropositive or micronegative pressures of -7 to +2kPa to ensure stability of methane production.