Garonne Communities Concerned about future Flood Risks

Communities around the Tarn river which comes from the Pyrenees down to the Mediterranean are concerned about future possible flood risks. This map identifies possible areas. The Tarn river is notorious for rising very quickly when it is flooding. Toulouse itself has flood barriers or levees but in fact there has even been some concerns about these.
http://www.ladepeche.fr/article/2010/03/04/789071-Garonne-la-peur-de-la-crue-du-siecle.html