Aquifers
- Created by: lucy
- Created on: 18-02-13 16:08
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- Aquifers
- Bodys of rock with high porosity so that large quantities of water can be stored
- Poorly cemented sandstones
- Limestones
- Fractured chalk
- Recharge zone
- Replenished through rainwater and can provide a constant supply of water
- Confined
- Overlain by impermeable rocks and the groundwater held within it is under hydrostatic pressure
- Ground water replenished through recharge zones
- Overlain by impermeable rocks and the groundwater held within it is under hydrostatic pressure
- Unconfined
- Open to the atmosphere, under atmospheric pressure
- Replenished through rain water
- Open to the atmosphere, under atmospheric pressure
- Perched aquifer
- Above regional water table
- Lens of impermeable rock prevents the water from percolating downwards
- Above regional water table
- Fossil aquifer
- No longer replenished -> non renewable
- Represents a relic of a past wetter climate
- Require careful management
- Ogallala aquifer, USA
- Untitled
- No longer replenished -> non renewable
- Bodys of rock with high porosity so that large quantities of water can be stored
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