Jisho

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Noun
1. water table; groundwater levelGeology
Wikipedia definition
2. Water tableThe water table is the surface where the water pressure head is equal to the atmospheric pressure (where gauge pressure = 0). It may be conveniently visualized as the 'surface' of the subsurface materials that are saturated with groundwater in a given vicinity. However, saturated conditions may extend above the water table as surface tension holds water in some pores below atmospheric pressure.
Read “Water table” on English Wikipedia
Read “地下水面” on Japanese Wikipedia
Read “Water table” on DBpedia

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