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We analyze long term series of mean monthly river runoff in the period 1931–2007 to characterize drought severity in 118 gauging stations across the Czech Republic. A threshold level method is employed using Q95 discharge as the threshold to identify periods during which the flow is below limit and thus considered as drought. We use both annual and monthly variable threshold. The drought parameters are the deficit volume and the duration. We observe the relation between deficit volume and the physical and geogra...