The spatial distribution of low flows in Poland not exceeded at an assumed probability

Abstract

Since most hydrological quantities are regarded as random variables, it is important that their distributions of probability be identifi ed. This paper therefore presents the results of a fi tting of most frequently-applied probability distributions to a series of minimum yearly fl ows. Specifi cally, the series of minimal annual discharges derived from 119 stream gauges located throughout Poland and re- lating to the period 1971-1990. The main task was to adjust one of the probability distribution functions applied most frequently (Fig. 1). Maps generated provide for the identifi cation of several regularities.