81 p. Fig., tab. Met lit.opg. This report is part of the project Harmonised Techniques and representative River Basin Data for Assessment and Use of Uncertainty Information in Integrated Water Management (HarmoniRiB) (EVK1-2002-00109), funded by the European Commission under the Fifth Framework Programme (Report VUA ; E05-03) (RIZA werkdocument ; 2005.119X)