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Overdrafting
Overdrafting is the process of extracting groundwater beyond the ''safe yield'' or equilibrium yield of the aquifer.
Since every groundwater basin recharges at a different rate depending upon precipitation, vegetative cover and soil conservation practises, the quantity of groundwater that can be safely pumped varies greatly among regions of the world and even within provinces. Some aquifers require a very long time to recharge and thus the process of overdrafting can have consequences of effectively drying up certain sub-surface water supplies. Subsidence occurs when excessive groundwater is extracted from rocks that support more weight when saturated. This can lead to a capacity reduction in the aquifer.
== Effects on climate ==
Aquifer drawdown or overdrafting and the pumping of fossil water may be a contributing factor to sea-level rise.〔(【引用サイトリンク】title=Rising sea levels attributed to global groundwater extraction )〕 By increasing the amount of moisture available to fall as precipitation, severe weather events are more likely to occur. To some extent moisture in the atmosphere accelerates the probability of a global warming event. The correlation coefficient is not yet scientifically determined.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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