The canton of Bern is at risk from devastating floods because its lakes, which take melt water from the mountains, are sometimes too small to contain all the water that comes their way. Catastrophic flooding in 1999, 2005 and 2007 led to reforms in water management in Bern. Bernard Wehren, the hydrologist in charge of regulating lake levels, told swissinfo what changes were made and what effect they have had. (SRF/Julie Hunt/swissinfo.ch)
