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There are many definitions of drought in the scientific literature but one of them is very characteristic: Drought is a condition of insufficient water to meet needs (Redmond, 2002). Motha (2000) defines four main types of drought: 1) meteorological drought, which is connected to the period with precipitation averaging below a critical threshold; 2) agricultural drought refers to the lack of sufficient moisture available for crops, forests, rangelands, and livestock; 3) hydrological drought, associated with water supply systems such as river drainage basins and aquifers; and 4) social or economic drought which is complex interaction of the natural phenomenon, environmental degradation, and human impact. Many analyses show that recently the number and intensity of droughts in the EU have dramatically increased. The number of areas and people affected by droughts went up by almost 20% between 1976 and 2006. One of the most widespread droughts occurred in 2003 when over 100 million people and a third of the EU territory were affected (COM/2007/0414). Total economic cost (primarily from agriculture) of the drought in 2003 was approximately US$13 billion, and in general higher than for floods (DG JRC, 2005). Common to all types of drought is a lack of precipitation (WMO, 1993). The precipitation is one of the main climate elements with important impact on various aspects of anthropogenic activity. The Abstract

Drought periods in non-mountainous part of South Bulgaria on the background of climate change