Supporting hydrology and related sciences worldwide

The IAHS community is more than 8000 strong with members in almost 200 countries contributing to the extensive programme of conferences and workshops, online discussions and IAHS publications   

Members are kept informed of IAHS activities and benefit from discounts on publications − those in the poorest countries receive free online subscriptions to Hydrological Sciences Journal and other discounts. Membership is FREE  

IAHS, a non-profit making non-governmental scientific organization registered in the UK

Unsolved problems in hydrology

Watch IAHS President Günter Blöschl present the new initiative to generate a list of Unsolved Problems in Hydrology on the IAHS YouTube channel  

Discussion has taken place via the LinkedIn group IAHS - International Association of Hydrological Sciences

A meeting took place in Vienna on 13 & 14 April 2018 to select and hone the questions. The questions are now under consideration and will result in a paper in HSJ. Information will be posted to the IAHS UPH page as it becomes available.



The call for Research Themes and Working Groups of Panta Rhei marked the start of the involvement of the community in Panta Rhei. The results from the first Biennium are published in the HSJ in a free access paper entitled 'Panta Rhei 2013-2015: Global perspectives on hydrology, society and change'.
The Panta Rhei virtual series includes the following free access papers:  'Adaptation of water resources systems to changing society and environment: a statement by the International Association of Hydrological Sciences' and 'Scientific debate of Panta Rhei research – how to advance our knowledge of changes in hydrology and society?'

Keep up to date with the Panta Rhei news page.

IAHS is one of the eight constituent associations of IUGG (


2019 IUGG General Assembly

The 27th IUGG General Assembly will be held 8-18 July 2019 at the Palais des Congrès in Montréal, Québec, Canada.

The IAHS programme will be in the week 9-14 July 2019. Registration is now open.

Program overview and symposia details:

For more information see