Hydrological Sciences Journal (HSJ) is the official journal of IAHS and provides a forum for original papers and for the exchange of information and views on significant developments in hydrology worldwide. Announcements of IAHS organized or sponsored meetings and book reviews are also included in the printed version. The HSJ impact factor is now 0.885 (ISI Journals Citation Report, 2003). IAHS has published a journal since 1956: it began as a quarterly publicationBulletin of the International Association of Scientific Hydrology (19561971) and Hydrological Sciences Bulletin (19721981)and became bimonthly in 1988. From 2005, the Journal is available online as well as in print.