Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.
Groundwater can also be perched (essentially in a pocket of impervious soil or rock where the water is essentially trapped) or in an aquider which has a very low permeability (the flow is very slow). In some areas this water may have been there for several thousand years and laid down in the last glaciation (ice age).
