perched karst spring
A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. Courtesy of the author & The Karst Waters Institute. 2002.
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spring, perched karst — The emergence of underground water some where above the basement of a calcareous massif caused by the interbedding of an impermeable or intermittent perched water table by restricting the vertical movement of water, which instead issues from… … Lexicon of Cave and Karst Terminology
Aquifer — Typical aquifer cross section An aquifer is a wet underground layer of water bearing permeable rock or unconsolidated materials (gravel, sand, or silt) from which groundwater can be usefully extracted using a water well. The study of water flow… … Wikipedia
Tourism in Croatia — A portion of the Walls of Dubrovnik that have protected a maritime city state of Dubrovnik one of Croatia s most popular tourist destinations … Wikipedia
Peace-Athabasca Delta — The Peace Athabasca Delta is a large freshwater, inland delta in northeastern Alberta located where the Peace and Athabasca Rivers join the Slave River at the western end of Lake Athabasca.ConservationThe marshes, lakes and mud flats of this area … Wikipedia