what is green water? and how it is differ from tap water?
Green water is that fraction of rainfall that infiltrates into the soil and is available to plants. It include soil water holding capacity and the continual replenishment of reserves by rainfall. Grey water on other hand side is domestic wastewater (excluding sewage). Tap water is drinking water that comes from an indoor tap.
Please have a look at this link and PDF attachments.
https://thewaternetwork.com/question-0-y/what-is-blue-green-and-grey-water-6uuv13bt8lVovKyD7Andyw
Dear Rushdi Sabah,
The blue water refers to freshwater . The green water refers to water stored in soil. The precipitation on land that does not run off or recharge the groundwater but is stored in the soil or temporarily stays on top of the soil or vegetation. The grey water is polluted water.
Green water can be made productive for crop growth (although not all green water can be taken up by crops, because there will always be evaporation from the soil and because not all periods of the year or areas are suitable for crop growth).
Freshwater availability on earth is determined by annual precipitation above land. One part of the precipitation evaporates and the other part runs off to the ocean through aquifers and rivers. Both the evaporative flow and the runoff flow can be made productive for human purposes. The evaporative flow can be used for crop growth or left for maintaining natural ecosystems; the green water footprint measures which part of the total evaporative flow is actually appropriated for human purposes. The runoff flow – the water flowing in aquifers and rivers – can be used for all sorts of purposes, including irrigation, washing, processing and cooling. The blue water footprint measures the volume of groundwater and surface water consumed, i.e. withdrawn and then evaporated. The grey water footprint measures the volume of water flow in aquifers and rivers polluted by humans. In this way, the green, blue and grey water footprint measure different sorts of water appropriation. When necessary, one can further classify the water footprint into more specific components. In case of the blue water footprint, it can be considered relevant to distinguish between ground and surface water use. In case of the grey water footprint, it can be considered valuable to distinguish between different sorts of pollution. In fact, preferably, this more specific pieces of information are always underlying the aggregate water footprint figures.
http://www.isric.org/isric/webdocs/docs/ISRICGreenwater%20ReviewFebr2004_.pdf
https://en.wikipedia.org/wiki/Greywater
With my best regards
Prof. Bachir ACHOUR
Please check the following link.
http://link.springer.com/article/10.1007/s40710-014-0040-8
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