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Base flow
The amount of water in a stream that results from groundwater discharge
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Basin
A river or lake basin is the area bounded by the watersheds of a system of streams and rivers that flow towards the same outlet. In the case of rivers this is generally the sea, but may be an inland water body, such as a lake or swamp
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Best management practices (BMPs)
measures applied to management activities to help ensure water efficiency and decrease water use
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Biofuel
Type of fuel whose energy is derived from biomass (biological carbon fixation), e.g. from plant starch, sugar or oil or from animal fat
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Blue Book
Tool that promotes exchange, dialogue and mobilization of stakeholders involved in managing water resources and services, in order to promote large-scale projects in partnership with decision makers, civil society and the private sector
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Blue water
Fresh surface and groundwater, i.e. the water in freshwater lakes, rivers and aquifers
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Borehole
Narrow shaft driven into the ground, either vertically or horizontally, to obtain water. A borehole may be constructed for many different purposes, including the extraction of water, oil or gas
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Brackish
Water that contains too much salt to be useful to people, but that is less salty than seawater