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90

Yistula ralley betioeen the outlets of Dunajec and Breń

Fig. 3. Maximal and minimal water levels at Szczucin gauging station during 1070

(flood) and 1971

influences indeed the hydrological regime of the river. Catastrophic freshets with outstanding very high water stages and large discharges (Fig. 3) occur in summer. Snow-melt freshets (March — April) are much smaller.

The largest maximum water stages were recorded in 1960 (934 cm) and in 1934 (992 cm). The values for the maximum discharges are esti-mated because some water has not passed throughout the water gauge

Fig. 4. Annual course of variability of transported materiał at Szczucin gauging station during 1971 and 1972 (flood)