Editing Dresden (section)

===Flood protection===
Because of its location on the banks of the Elbe, into which some water sources from the Ore Mountains flow, flood protection is important. Large areas are kept free of buildings to provide a flood plain. Two additional trenches, about 50 metres wide, have been built to keep the inner city free of water from the Elbe, by dissipating the water downstream through the inner city's gorge portion. Flood regulation systems like [[detention basin]]s and [[water reservoir]]s are almost all outside the [[Urban area|city area]].

The [[Weißeritz]], normally a rather small river, suddenly ran directly into the main station of Dresden during the [[2002 European floods]]. This was largely because the river returned to its former route; it had been diverted so that a railway could run along the river bed.

Many locations and areas need to be protected by walls and sheet pilings during floods. A number of districts become waterlogged if the Elbe overflows across some of its former floodplains.<ref>{{Cite web|url=https://www.dresden.de/de/stadtraum/umwelt/umwelt/hochwasser/vergangenheit.php|title=Hochwasser in der Vergangenheit|website=www.dresden.de|accessdate=4 April 2023}}</ref>

<gallery mode="packed">
File:Weisseritz in Löbtau zur Jahrhundertflut 2002.jpg|Floods in 2002
File:Semperoper-flood-2005-03-22.jpg|[[Semperoper]] during 2005 floods
File:Flood dresden april2006 004.jpg|Elbe flood in April 2006
File:Elbe 030406 2.jpg|Dresden skyline in 2006
File:Elbe-Hochwasser-Dresden-Juni2013-18.jpg|[[2013 European floods|Dresden under water in June 2013]]
</gallery>