Hydrological Processes is an international journal devoted to the publication of original scientific and technical papers in hydrology. The objective of these communications is to improve our understanding of hydrological processes. The scope of the journal encompasses disciplines focussing on the physical, biogeochemical, mathematical and methodological aspects of hydrological processes together with research on instrumentation and techniques. The journal also publishes several issues annually, which relate to themes emergent from conferences, hydrological science societies and key research topics identified by editorial board members. Comments on previously published papers may be submitted to HP. The authors of the original work will be given the opportunity to submit a reply for simultaneous publication with the Comment. Comments and Replies will be subject to the normal journal review process. For publication of a Comment or a Reply, they must be judged by the referees to be scientifically significant. Comments should preferably be in the form of a short paper not exceeding the length of two printed journal pages. Publication will take place only when all parties have had an opportunity to respond appropriately. All papers for HP should be prepared in accordance with the notes for contributors . Submit papers to the Editor-in-Chief of HP or one of the Associate Editors HPToday is devoted to research and sources of information which are considered to be deserving of rapid dissemination to hydrologists. As such, it should be seen as a forum for rapid scientific communication and as a vehicle for up-to-date dialogues in hydrological sciences. HPToday includes invited commentaries, letters to the editor, and refereed scientific briefings. All papers for HPToday should be prepared in accordance with the notes for contributors . The journal to which you are submitting your manuscript employs a plagiarism detection system. By submitting your manuscript to this journal you accept that your manuscript may be screened for plagiarism against previously published works is devoted to research and sources of information. Please note: Effective from the start of the 2011 volume, this journal will be published online-only