Every year between autumn and spring, Venice and the neighboring costal town of Chioggia suffers from bouts of temporary flooding caused by exceptionally high tides that occur in the northern Adriatic Sea. The phenomenon is locally known as acqua alta.
Acqua alta causes very limited inconvenience to Venetians and tourists. In these cases, the only thing to do is to be patient and wait a few hours for the following ebb. Otherwise, grabbing a pair of cheap rubber boots is recommended.