In 2025, UNESCO marks two significant milestones: the 50th anniversary of its Intergovernmental Hydrological Programme (IHP), launched in 1975, and the 60th year of its broader commitment to water sciences. 

Since its inception, IHP has stood as the sole intergovernmental UN initiative devoted to water research, management, education and capacity building. 

Beginning with research in arid zones during the 1950s and the International Hydrological Decade (1965–1974), the Programme evolved into a global network comprising specialised centres, academic chairs and national committees. Over the past half-century, IHP has fostered international collaboration, facilitating the development of scientific methods and practical applications in areas such as groundwater assessment, flood and drought monitoring, water quality control, snow and glacier modelling, and nature-based solutions. These efforts have translated into tangible support for Member States, bolstering both national water policies and local community resilience.

This landmark year features a series of events and publications. The commemorative launch took place on 22 January at UNESCO’s Paris headquarters, followed by the main international celebration from 10 to 13 June, including panels, symposia and cultural performances. Numerous webinars and regional gatherings are scheduled throughout the year, reflecting IHP’s theme for 2022–2029: “Science for a Water-Secure World in a Changing Environment”.

Looking ahead, UNESCO plans to publish a series of commemorative works, such as a special edition on hydrological science, a book with Cambridge University Press, and a historic volume on six decades of water research. In alignment with global agendas, the ninth phase of IHP prioritises international scientific innovation, capacity building, policy support and public engagement, with particular attention to emerging challenges such as climate change and transboundary water management.

In essence, this dual anniversary not only celebrates a legacy of excellence in water science but also underscores UNESCO’s enduring dedication to securing water resources through science, education and multilateral cooperation.