Supporting hydrology and related sciences worldwide

The IAHS community is more than 9,000 strong with members in over 150 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

The framing publication is available as an author accepted manuscript in HSJ. ‘Twenty-Three Unsolved Problems in Hydrology (UPH) – a Community Perspective’ the open access link is 



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 HSJ also has two dedicated Panta Rhei virtual series of free access papers:
Panta Rhei Article Collection and  Panta Rhei Opinion Paper Series: A list of opinion papers, replies and discussions

Keep up to date with the Panta Rhei news page.

IAHS is one of the eight constituent associations of IUGG (


IAHS 2022
Scientific Assembly

Save the date: The next Scientific Assembly  (IAHS 2022) will take place in Montpellier, France from 29 May to 3 June 2022.  

Registration is now open.

Scientific Programme

There are three major focuses:

·       Panta Rhei decade (2013-2022) on change in hydrology and society

·       UPH initiative, "Unsolved Problems in Hydrology"

·       the 100th anniversary year of IAHS

IAHS 2022 homepage