Global Runoff Data Centre (GRDC)
... the digital world-wide repository of discharge data and associated metadata ... focusing the multifaceted world of global river discharge data for the sake of key research linking local and global change issues ... mandate reinforced by WMO Resolution 21 (Cg-XII), 1995 and a Support Letter from WMO Secretary General (July 2004) [in 5 languages]
The link address is: http://grdc.bafg.de/servlet/is/987/?lang=en