The article "Hydrological Drought Explained" by Anne F. Van Loon provides a comprehensive overview of hydrological drought, its processes, quantification, and impacts. Hydrological drought refers to the lack of water in rivers, lakes, and groundwater, which is a part of the broader drought phenomenon. The author discusses the complex nature of drought, emphasizing its impact on ecosystems and society. Key topics include the definitions of drought, the processes that lead to and recover from hydrological drought, the influence of climate and terrestrial properties, and the challenges in quantifying and managing drought. The article also highlights recent advances in drought monitoring and prediction, as well as the need for more research on future projections and management strategies. It concludes by defining four major challenges for future research on hydrological drought, aligning with international initiatives like the IPCC and the IAHS.The article "Hydrological Drought Explained" by Anne F. Van Loon provides a comprehensive overview of hydrological drought, its processes, quantification, and impacts. Hydrological drought refers to the lack of water in rivers, lakes, and groundwater, which is a part of the broader drought phenomenon. The author discusses the complex nature of drought, emphasizing its impact on ecosystems and society. Key topics include the definitions of drought, the processes that lead to and recover from hydrological drought, the influence of climate and terrestrial properties, and the challenges in quantifying and managing drought. The article also highlights recent advances in drought monitoring and prediction, as well as the need for more research on future projections and management strategies. It concludes by defining four major challenges for future research on hydrological drought, aligning with international initiatives like the IPCC and the IAHS.