13 
Kotobrzeg, however, there has clearly been a change (from 19% to 30%) in the occurrence 
of maximum levels - from the 570-580 cm to the 580-590 cm range. 
Also an increase in the number of very high storm surges (with maximum levels exceeding 
640 cm) was observed at the two above-mentioned Polish stations. At Swinoujscie, the 
number of storm surges with maximum levels of about 570 cm decreased during the last 25 
years of the 20 th century. 
15 
Swinoujscie 
jil 
Ü 
JL 
600 610 620 630 640 
maximum sea-level in cm 
| | 1950-1975 
1976-2000 
Fig. 3.2. Frequency distribution of maximum sea levels at Swinoujscie during storm surges 
in 1950-1975 and 1976-2000 
30 
EL 
J7L 
Kotobrzeg 
J2L 
540 550 560 570 580 590 600 610 620 630 640 650 
maximum sea-level in cm 
1950-1975 7 
1976-2000 
Fig. 3.3. Frequency distribution of maximum sea levels at Kotobrzeg during storm surges 
in 1950-1975 and 1976-2000