-10- 
flooded as well. During the period of intense rains in (5. - 6.07.97) the first flood wave 
occurred in drainage areas of Mala Wisla, Sola, Skawa and Raba and within left side 
branches of Wisla, i.e.: Nida, Kamienna. During next period (6. - 7.07.97) heavy rains 
occurred in drainage area of Dunajec mainly. The most significant rains occurred in 
Tatra Mountains in 8. - 9.07.97, when sum of precipitation reached absolute maximum 
values. And even in some cases they exceeded those values. As can be seen the time of 
persistence of the rains was important factor influencing the flood extension. 
Table. 
Average daily sum of precipitation [mm] in different periods of floods 
River 
4. - 9.07.97 
20.-22.08.72 
17.-19.07.70 
Mala Wisla 
300 
227 
187 
Sola 
229 
159 
180 
Raba 
276 
219 
232 
Dunajec near Czorsztyn 
166 
172 
176 
Dunajec near Nowy Sacz 
239 
161 
186 
The culmination waves were observed in 8. - 9.07.97. The values were higher than 
warnings levels as follows: 
• Zywiec - Sola - 102 cm 
• Zator - Skawa - 210 cm 
• Proszowki - Raba - 213 cm 
• Kowaniec - Dunajec - 150 cm 
• Zabno - Dunajec - 349 cm 
The flood waves on Mala Wila and Sola overlapped each other resulting in one wave 
similar to that observed in 1972. The most significant feature of the wave observed 
near Bielany it was very long period of its persistence even longer than in 1972. Near 
Sandomierz last year flood was similar to that in 1930, near Zawichost similar to 1980 
and finally near Warszawa water levels were less than in 1960. 
In the lower part of Vistula within Zulawy Lowland area the maximum flow (4000 
m7s) occurred on 19/20.07.97. The flood wave was equal ca. 50% of the highest water 
recorded whenever in the past. The second wave occurred in 29.07 - 6.08.97 and it 
wasn’t so high as the previous one.