Useful pages
Danube Commission http://www.danubecom-intern.org/
Central Commission for Navigation on the Rhine http://www.ccr-zkr.org/
NAIADES http://www.naiades.info/
RIS Portal http://www.ris.eu/
Water levels
German http://www.elwis.de/gewaesserkunde/Wasserstaende/index.html
Austrian http://www.doris.bmvit.gv.at/pegel_und_seichtstellen/pegelstaende/
Slovak http://www.povodia.sk/dunaj/sk/
Hungarian http://www.hydroinfo.hu/
Croatian http://www.crup.hr/index.php?page=waterlevels
Serbian http://www.hidmet.gov.rs/eng/hidrologija/radio.php
Romanian http://www.afdj.ro/cote/cote_en.htm
Bulgarian http://www.appd-bg.org/en/