Definition
Subsurface waters can be divided into two categories (Fig. 1): (i) water in the unsaturated or vadose zone and (ii) water below the water table, occurring in the saturated or phreatic zone. The term “groundwater” traditionally refers to the latter.
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Percopo, C., Guerra, M. (2018). Groundwater. In: Bobrowsky, P.T., Marker, B. (eds) Encyclopedia of Engineering Geology. Encyclopedia of Earth Sciences Series. Springer, Cham. https://doi.org/10.1007/978-3-319-73568-9_150
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