Aquifers in young sedimentary formations are prone to compaction as a result of water abstraction, and therefore the decrease in intergranular pore pressure. For example, this has been the case in the aquifers underlying Venice or Mexico City. More dramatic collapses occur commonly in karstic landscapes, where oscillations in water tables as a result of groundwater abstractions can precipitate the occurrence of karstic collapses. In both cases, the amount of subsidence or the probability of collapses is related to the decrease in water pressure. Fortunately, these types of geotechnical problems are not relevant in Spain.
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