Science · 6 pages · 12 min
How an aquifer can be confined
A confined aquifer is a permeable bed under pressure, sealed above and below by tighter layers.
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From the opening
A confined aquifer is a permeable layer sandwiched between layers that resist flow, so the water in it is under pressure and is not open to the sky through the pores overhead. Recharge enters where those sealing layers are missing, often at a distant outcrop. The opening covers a permeable bed between tight layers, why an artesian well flows, and how a pressure surface is mapped.
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Inside
- A permeable bed between tight layers
- Why an artesian well flows
- How a pressure surface is mapped
- Why confinement is rarely perfect
- Where the idea stops applying
- A distinction worth keeping
Sources
- Confined aquifers and artesian pressure
- Recharge of a confined bed at its outcrop