A LOW-FLOW HAZARD INDICATOR

The paper presents, developed by the author, low-flow hazard indicator for particular regions of the country. The construction of the indicator includes results of analyses of low flows that occurred in Poland in 1951-2000. The analyses were based on daily flow values at 72 gauge stations located throughout Poland. The equation is based on the assumption that low flow hazard is the highest in those areas where low flow events are the most frequent, their total duration is the longest and the probability of their occurrences is high. The equation can be used to calculate hazard indicator for both summer-autumn and winter low flow events using values of parameters characterizing given low flow type. Assessment of low flow hazard in particular areas was carried out for summer-autumn low flows because of their prevalence both in frequency and duration in Poland.