perched groundwater

perched groundwater

[′pərcht ′grau̇nd‚wȯd·ər]
(hydrology)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Within the glacial deposits there are permeable shallow zones of sand and gravel forming perched groundwater that respond to short term rainfall fluctuations and there are indeed localised problems encountered, particularly after a wet season like last summer.
The open-face shield method of tunnel construction, incorporating a part-face tunnel machine, encountered variable conditions, including perched groundwater, formational materials, and running/flowing soils.