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What are the hydrological drought definition

Hydrological droughts are more related to water demands and they appear whenever a marked reduction becomes appreciable in natural streamflow or groundwater levels, plus the depletion of water storage in dams and lakes for water supply. Hence, hydrological droughts are very important and significant for urban areas or industrialized regions as well as for agricultural activities. The main impact of hydrological droughts is on water resources systems. Hydrological drought is not attached to the precipitation decrease only, but additionally decreases in the surface flow and drops in the groundwater levels provide joint impacts (Sirdas and Sen, 2003). Hydrological droughts are related to agricultural droughts by its effects on irrigation systems dependent on surface water and on river water quality.

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