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Reproducing the hydrological process of river runoff is a fundamental part of water resources planning and management. Finding a mathematical model to reproduce the runoff time series aims not only to extract maximum information from the limited available data, but also to extrapolate into the future by representatively generating the historical runoff process. Almost all management decisions are based on forecasts. Our present is characterized by the increasingly frequent occurrence of hydrometeorological process...

Hydrological droughts are formed by different processes, but how strong and heterogeneous they are, leading to different manifestation and characteristics of the droughts. Droughts have no distinct starting date, but different methods gives a course of action that may help to identify dry signals and possible drought conditions for early warning. We choose hydrological drought indices that are applicable for Bulgarian conditions. Using statistical methods, minimum flow, deficits and spatial characteristics can be ...