History
Prior to the founding of St. Petersburg in 1703, the largest flood occurred in 1691. Swedish annals report that the water covered the entire area of the present St. Petersburg by 25 feet (7.62 meters). Knowing about frequent floods from the locals, the Swedes laid the fortress Nyenschantz and the city of Nyen away from the delta upstream of the Neva River, at the confluence of the river Ohta to Neva.
The first flood in St. Petersburg city occurred 3 months after its founding, on the night of 19 to 20 August 1703. The water rose more than 2 meters. The water rose much higher on 20 September 1706, which in his letter to Alexander Menshikov, Peter I described as "the west-south-west wind brought the flood undescribed before. In my offices, it stood 21 inches above the floor, and people traveled by boats through the city streets. Yet it did not last long, less than 3 hours. And it was amusing to see people on the roofs and trees... Water was high, but didn't cause much harm ".
Engineering measures were instituted in the early 18th century, and the central part of the city was flooded by only 130–150 cm. Floods are registered in St. Petersburg when water rises above 160 cm at the level gauge at the Saint Petersburg Mining Institute; floods up to 210 cm are considered dangerous, up to 299 cm very dangerous and above 300 cm catastrophic. Of the 324 floods in the history of St. Petersburg, three were catastrophic.
Most floods occur in between September and December. Between 1703 and 2003, 324 floods were recorded with the height above 160 cm, of which 210 were higher than 210 cm. Some years have had several floods (five in 1752), and there are periods in which no flooding occurred (e.g. 1744–1752).
Read more about this topic: Floods In Saint Petersburg
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