loods up to 210&#160;cm are considered dangerous, up to 299&#160;cm very dangerous and above 300&#160;cm catastrophic. Of the 324 floods in the history of St. Petersburg, three were catastrophic.<sup id="cite_ref-f1_11-0" class="reference"><a href="#cite_note-f1-11"><span>[</span>11<span>]</span></a></sup></p>
<p>Most floods occur in between September and December. Between 1703 and 2003, 324 floods were recorded with the height above 160&#160;cm, of which 210 were higher than 210&#160;cm. Some years have ha