Levels of the rivers which have their sources in the Tatras and the Gorce Mountains rose immediately, and on 19 July the flood wave, swollen by excessive waters of the tributaries, appeared on the Vistula near Sandomierz. Due to pressure of the water, levees were broken, and thousands of acres of fields were covered in water. At the same time, this caused the flood wave to decrease, and by the time it reached Warsaw (22 July), it was much smaller than expected, and did not inflict much damage in Poland’s capital.
