Answer: under pressure rises above the aquifer level
Step-by-step explanation:
An artesian system is one that connects with an accumulation of water (aquifer) whose surface or level is above the surface of the system or well.
In other words, the upper limit of the aquifer is higher than the opening through which the liquid flows in the artesian well. This has the advantage that the water spreads without needing to be pumped.
It should be noted that its name comes from the region of Artois, France, where in 1126 the oldest well in Europe was drilled with these characteristics.
Therefore:
An artesian system is present when groundwater under pressure rises above the aquifer level.