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The development of indicator systems for drought identification is part of the Drought Management Plans. The analysis of the correlation between the different indices is an essential part of the indicator systems. That research is part of a task related to the developed at NIMH system (http://hydro.bg) of drought indicators and the development of recommendations for their simultaneous use. For this purpose, the influence of climatic factors on the hydrological cycle components and the role of the characteristics o...

Drought indicator systems help decision-makers to understand how and where the drought occurred and to take measures from the Drought Management Plans. The main goal in the Water Framework Directive (WFD) is the achievement -good ecological status-, but the Article 4.6 allows temporary deterioration of the status, occurred as a result of so called -prolonged drought-. Reduction of natural water resources such as rivers, lakes, aquifers, is associated with the reduction in available water resources for water supply...