/sup></p>
<p>Engineering measures were instituted in the early 18th century,<sup id="cite_ref-b1_10-0" class="reference"><a href="#cite_note-b1-10"><span>[</span>10<span>]</span></a></sup> and the central part of the city was flooded by only 130–150&#160;cm. Floods are registered in St. Petersburg when water rises above 160&#160;cm at the level gauge at the <a href="//en.wikipedia.org/wiki/Saint_Petersburg_Mining_Institute" title="Saint Petersburg Mining Institute">Saint Petersburg Mining Institute</a>; f