During the PLEN-CC12, the Dutch delegation referred to the period of extremely low water in 2011, which gave rise to different problems and measures in the Netherlands. It was convened that all delegations would deliver a survey on available national knowledge on all low water periods in 2011. Germany, France, Liechtenstein, Luxembourg, the Netherlands, Austria and Switzerland delivered the required information by end 2011/beginning 2012, and a synthesis was drawn together with an assessment..