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In accordance with General Regulation 26, the second session of the WMO Hydrological Assembly will be held remotely through the virtual platform Zoom on 12 and 14 October 2021 between11:00 and 14:00 UTC.

The ZOOM link for the session will be sent by COB (Geneva time) on Friday 8 October 2021. 

The Tentative Workplan for the Hydrological Assembly is available here

Simultaneous interpretation will be provided in Arabic, Chinese, English, French, Russian and Spanish.

The Hydrological Assembly should be attended as a rule by the Hydrological Advisers of Members (in accordance with General Regulation 5 (b)) and by other representatives of National Hydrological Services or other national hydrological agencies as designated by Members.

Chair and Vice-Chair of the Assembly

Cg-18 appointed J.Danhelka (Czech Republic) and J.A. Zuñiga Mora (Costa Rica) as the Chair and Vice-Chair respectively of the Hydrological Assembly. The Terms of Reference of the Hydrological Assembly contained in Annex 2 to Resolution 24 (Cg-18) stipulate that the Hydrological Assembly shall elect a chairperson and vice-chairperson, who will represent the Hydrological Assembly between sessions of Congress.

As this session of Congress is Extraordinary and dedicated to hydrological matters, the Assembly is also convened. Therefore the chairmanship and vice-chairmanship of Mr Danhelka and Mr Zuñiga Mora will continue until the next ordinary session of Congress (Cg-19) in 2023.

The following documents will be discussed during the Hydrological Assembly.

Note: links in the table below will be activated as the documents become available

Document N°

Document title


Latest version


ar - zh - en - fr - ru - es
​Draft 2 uploaded on 20.09.2021
Report of HCP Chair.ppsx
Cg-Ext (2021)/Doc. 3.1 WMO Vision and Strategy for Hydrology and its associated Plan of Actionar - zh - en - fr - ru - es​​Draft 2 uploaded on 06.10.2021

Cg-Ext (2021)/Doc. 3.1(2)

Advanced implementation of elements of the Plan of Action for Hydrology

ar - zh - en - fr - ru - es​Draft 2 uploaded on 11.10.2021
HA-2-d02WMO Hydrological Research Strategy 2022‑2030ar - zh - en - fr - ru - es

​Version adopted by the Hydrological Assembly
 RB Hydro Strategy summary.pdf
HA-2-d03Sustainability Strategy for the Flash Flood Guidance System with Global Coverage (FFGS/WGC)


ar - zh - fr - ru - es
(Executive Summary)

​Version adopted by the Hydrological Assembly without changes
FFGS/WGC Sustainability Strategy summary.pdf

End of Pilot Phase Report of the WMO Hydrological Status and Outlook System (HydroSOS)

ar - zh - en - fr - ru - es
​Version adopted by the Hydrological Assembly
HydroSOS Summary.pdf
HA-2-d05Plan for the establishment of WMO Hydrological Centres in GDPFSar - zh - en - fr - ru - es​Version adopted by the Hydrological Assembly
Hydrological Centres in GDPFS summary.pdf
HA-2-d06Terms of reference of the Global Hydrometry Support Facility governing bodies ar - zh - en - fr - ru - es​Version adopted by the Hydrological Assembly without changes
 GHSF (HydroHub) summary.pdf
HA-2-d07Terms of Reference of the Management Committee of Project Xar - zh - en - fr - ru - es​Version adopted by the Hydrological Assembly
 ProjectX summary.pdf
Cg-Ext (2021)/Doc. 3.2 WMO Water Declaration ar - zh - en - fr - ru - es​Draft 2 uploaded on 08.10.2021
Cg-Ext (2021)/INF. 3.1 Report of the Hydrological Assemblyen
​Preliminary draft for discussion by the HA
Cg-Ext (2021)/INF. 3.2 Water and Climate Coalition en 

WMO Hydrology Survey.pdf