Verfication of empirical formuals for calculating mean low flow in reflect to affecting on disposable water resources

Aim of the study: The study evaluated verification of empirical formulas for calculating mean low flow (MLF) in reflect to shaping disposable water resources for mountain catchments, located in upper Vistula Basin. The following empirical formulas were analyzed: Punzet and Stachý. Material and methods: The studies were conducted according to following stages: analysis of significant trends for low flows in analyzed catchments, the mean low flows determination using analyzed methods, determination of disposable water resources regarding to MLF obtained from analyzed methods. Results and conclusions: The analysis showed lack of significant trends in low flows courses for analyzed catchments. Also the analysis indicated significant differences between MLF derived from hydrological data and empirical formulas. The obtained results indicated the need to update empirical formulas for calculating MLF especially regarding to disposable water resources determination, in ungauged catchments, in reflect to mean low flows.