Lincolnshire , which had one of the largest siren systems in the country had 46 sirens based in North Somercotes , Mablethorpe , Boston , Skegness , Spalding and Sutton Bridge , as well as inland at Louth , Horncastle , Middle Rasen and Gainsborough , the areas most at risk of being hit by floods . Following serious flooding in the summer of 2007 , investigations took place into how the flood warning system could be improved . The Environment Agency admitted that the warning system in Louth had not sounded early enough . In April 2008 , Lincolnshire County Council began to investigate the possibility of replacing the flood warning sirens with mobile phone alerts . A council report in November 2009 described the sirens as being " outdated , in the wrong places and difficult to repair " . The sirens were eventually decommissioned in November 2011 and replaced with Floodline
serious flooding in the summer of 2007
2007 United Kingdom floods
Civil defense siren