1957 Valencia flood
1957 CE.
Shown on the map at 39.470°, -0.377°.
A flood on 14 October 1957 in Valencia, Spain, resulted in significant damage to property and caused the deaths of at least 81 people. In response to the tragedy, the Spanish government devised and enacted the Plan Sur, which rerouted the city's main river, the Turia.
Text from the Wikipedia article 1957 Valencia flood, licensed CC BY-SA 4.0.