Hydrological drought – processes and estimation methods for streamflow and groundwater

Drought is a worldwide phenomenon that originates from a prolonged deficiency in precipitation, often combined with high evaporation, over an extended region. The resultant meteorological water balance deficiency may cause a hydrological drought to develop into below normal levels of streamflow, lakes, and groundwater. Contemporary knowledge and experiences from an international team of drought experts are consolidated in a textbook (Tallaksen et al., 2023), which builds on an earlier edition (URL 1), however with significant new material added. An updated synthesis was needed because of hydrological drought-issues that has been emerged over the last 15 years, particularly when much of the topic is currently…