Despite of the 2003 report of the Ministry of Environment in which the territory of the municipality of Venice was not explicitly classified as an area vulnerable to hydro-geologic risk, a wide flooding took place on the 26th September 2007. It was necessary to appoint a Delegate Commissary to deal with this emergency. The flooding was due to unprecedented rain covering all the territory of the municipality causing a crisis of the water-drainage system.
Furthermore, the ancient historical centre is in danger of flooding. After the big flooding in 1966, when the Lagoon water rose up to +194 cm, the Lagoon water exceeded the +140 cm limit (of which it is considered a big flood) 11 times.