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State of the soil or of an environment resulting from a lack of rain. It generally occurs when the amount of rain is significantly lower than seasonal norms, and this over a fairly long period.
A type of drought corresponding to a pronounced and prolonged deficit of precipitation.
A type of drought characterized by a water deficit in the surface soils (between 1 and 2 m deep), sufficient to alter the good development of vegetation.
Type of drought affecting water levels in environments: lakes, rivers or groundwater show abnormally low levels. It depends on precipitation but also on the state of the soil affecting runoff and infiltration.
Induced change in the dynamics of the biosphere by human activities, directly or not.