- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 12 Feb 2019
The term 'groundwater' refers to all water which is below the surface of the ground and within the permanently saturated zone. A groundwater body is a distinct volume of groundwater within an aquifer. The term ‘hydrogeology’ refers to the nature, distribution and movement of groundwater in soils and rocks, including in aquifers. Ref The HS2 London-West Midlands Environmental Statement, Glossary of terms and list of abbreviations, DETR 2013.
Groundwater is an important part of the water cycle which continually moves water through the environment. Water evaporates from the oceans and condenses into clouds, before falling onto land as rain and flowing into rivers and back into the oceans.
However, the ground has the potential to interrupt this cycle, absorbing rainwater like a sponge. Some of this water will return to the atmosphere through processes such as transpiration, while some will infiltrate deeper into the ground where it becomes groundwater.
The water table is the level at which the ground becomes saturated and water will flow to a point of discharge such as a spring, lake, river or sea. Groundwater plays a vital role in supporting industry, wells, wetlands, stream flows, and so on. The water table may rise during periods of heavy rain or melting snow, or fall during drier periods, or as a result of extraction.
In some parts of the world, water shortages can be experienced when groundwater supplies are used faster than they are replenished, while in other regions, groundwater can cause flooding or can become polluted by human activities such as industry and agriculture.
Nearly 30% of global freshwater originates from groundwater, and almost all the water used for agriculture, industry and drinking will have been groundwater at some point in its cycle.
Some geological formations are impermeable to groundwater whilst others are permeable. Permeable formations – known as aquifers – have fine holes or networks of fine cracks that allow water to flow through them. The size of the spaces in the soil or rock, as well as how well they are connected, determines the speed of groundwater flow.
In the UK, hydrogeologists are work to ensure groundwater is maintained in sufficient supply with a quality that is protected. In developing countries, hydrogeologists may work on rural water supply projects to help provide safe and accessible water.
 Related articles on Designing Buildings Wiki
- Base flow index.
- Groundwater control in urban areas.
- Fertilizer groundwater pollution.
- Pumps and dewatering equipment.
- Reservoir construction.
- River engineering.
- Sewer construction.
- Sustainable water.
- Types of water.
- Water engineering.
- Water table.
 External resources
Featured articles and news
A vision for digital highways
Finding stone to conserve historic buildings.
If it is not planned properly even a simple activity can kill.
A disgruntled or ignored stakeholder can easily derail your hard work.
Next generation cementitious materials
Still going strong...one of the great buildings of the 20th century.
Review of the bible for heritage assets and their management.
The David Lloyd Lymington Sports Village was 'Commended' in CIAT's 2018 AT Awards.
How do we make the smart city a reality?
Sir Nicholas Grimshaw has been awarded the UK’s highest honour for architecture.
Protecting the construction industry from Brexit.
Conceiving buildings collaboratively, testing them virtually.
Effective collaboration in post-disaster response and recovery