10 Facts About Water footprint

In 2002, the water footprint concept was introduced in order to have a consumption-based indicator of water use, that could provide useful information in addition to the traditional production-sector-based indicators of water use.

The water footprint is a geographically explicit indicator, not only showing volumes of water use and pollution, but the locations.

Blue water footprint refers to the volume of water that has been sourced from surface or groundwater resources and has either evaporated, or been incorporated into a product or taken from one body of water and returned to another, or returned at a different time.

Green water footprint refers to the amount of water from precipitation that, after having been stored in the root zone of the soil, is either lost by evapotranspiration or incorporated by plants.

Grey water footprint refers to the volume of water that is required to dilute pollutants to such an extent that the quality of the water meets agreed water quality standards.

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For consumers, businesses and geographic area, water footprint is indicated as volume of water per time, in particular:.

Water footprint is one of a family of ecological footprint indicators, which includes carbon footprint and land footprint.

The water footprint concept is further related to the idea of virtual water trade introduced in the early 1990s by Professor John Allan .

Internal water footprint is the amount of water used from domestic water resources; the external water footprint is the amount of water used in other countries to produce goods and services imported and consumed by the inhabitants of the country.

Water footprint accounting has advanced substantially in recent years water footprint analysis needs sustainability assessment as its last phase.