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Last edited 12 Feb 2019
Principal aquifers are layers of rock or drift deposits that have high intergranular and/or fracture permeability, meaning they usually provide a high level of water storage and transmission. They may support water supply and/or river base flow on a strategic scale. In most cases, principal aquifers are aquifers previously designated as major aquifers.
There are two types of secondary aquifer designation:
- Secondary A: permeable layers capable of supporting water supplies at a local rather than strategic scale, and in some cases forming an important source of base flow to rivers. These are generally aquifers formerly classified as minor aquifers.
- Secondary B: predominantly lower permeability layers which may store and yield limited amounts of groundwater due to localised features such as fissures, thin permeable horizons and weathering. These are generally the water-bearing parts of the former non-aquifers.
 Related articles on Designing Buildings Wiki.
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- Flood and water management act.
- Flood risk.
- Groundwater control in urban areas.
- Pumps and dewatering equipment.
- Water Act 2014.
- Water conservation.
- Water consumption.
- Water engineering.
- Water framework directive.
- Water table.
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