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Drawing of an artesian well. An artesian aquifer is an underground layer which holds groundwater under pressure. This causes the water level in the well to rise to a point where the pressure is equal to the weight of water putting it under pressure.n aquifer is a geologic layer which can hold water such as sand and gravel, limestone, or sandstone, through which water flows and is stored. An artesian aquifer is trapped between rocks or clay which causes the pressure.
Seawater intrusion due to pumping. The most common source for seawater intrusion is when the pressure in the aquifers is lowered, this causes an up dwelling of saline water into the aquifers. As you can see from fig. 2, the usage of groundwater causes a depression in the water level and a seawater intrusion.eawater intrusion is when saline water, defined as water with a concentration of dissolved salts of more than 1000 mg/L, migrates into the groundwater system. When the fresh water in aquifers gets replaced by saline water the wells becomes useless for drinking and agriculture.