Wetland

A flooded area where the water is shallow enough to enable the growth of bottom-rooted plants and these exceed the proportion of open water.

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Wet

Containing water under dry weather conditions.

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Water Cycle

The continuous circulation of water in systems throughout the planet, involving condensation, precipitation, runoff, evaporation and transpiration.  It is also known as the hydrological cycle.

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Water Table

The point where the surface of groundwater can be detected. The water table may change with the seasons and the annual rainfall.

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Watercourse

A term including all rivers, streams, ditches, drains, cuts, culverts, dykes, reens, sluices and passages through which water flows.

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Waste

Any substance or object that the holder discards, intends to discard, or is required to discard.

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UKCIP

The UK Climate Impacts Programme (UKCIP) has developed the UK Climate Projections (UKCP09).  These projections of our changing climate provide information for the UK up to the end of this century.  It is expected that average annual rainfall in Wales could increase by up to 20% within 50 years.  Summers will be drier (with baseflows […]

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Treatment volume

The volume of surface runoff containing the most polluted portion of the flow from a rainfall event.

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Treatment

Improving the quality of water by physical, chemical and/or biological means.

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Transpiration

The loss of water vapour through plant leaves.

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Cyfoeth Naturiol Cymru / Natural Resources Wales Welsh Water / Dwr Cymru Welsh Government / Llywodraeth Cymru Atkins Welsh Local Government Association Consumer Council for Water
Home Builders Federation CIWEM Institute of Civil Engineers