 After five years of work (2005–2010), in late November 2010 the new Seville lock designed to regulate tides was finally in operation.The Guadalquivir River Basin occupies an area of 63,085 km2 and has a long history of severe flooding.During the winter of 2010 heavy rainfall caused severe flooding in rural and agricultural areas in the provinces of Seville, Córdoba and Jaén in the Andalusia region.