• Base flow
    The amount of water in a stream that results from groundwater discharge
  • 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
  • Best management practices (BMPs)
    measures applied to management activities to help ensure water efficiency and decrease water use
  • 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
  • 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
  • Blue water
    Fresh surface and groundwater, i.e. the water in freshwater lakes, rivers and aquifers
  • 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
  • Brackish
    Water that contains too much salt to be useful to people, but that is less salty than seawater