Regional Activities in Hydrology
Decisions concerning the implementation of the regional activities are taken by the WMO Regional Associations at their four-yearly meetings. The six Regional Associations of WMO have each established a working group on hydrology (WGH), and a Regional Hydrological Adviser (RHA) represents his/her entire Region and authoritatively represents the regional hydrologic concerns, problems or expectations, particularly as based on regional consultations. At the national level, the Hydrological Adviser (HA) is the ambassador of WMO hydrology.

RA I - Africa
Working Group on Hydrology
- WMO RAI Working Group on Hydrology
- Report of the eleventh session of the WMO RA I Working Group on Hydrology (WGH) 16 – 20 November 2015, Accra, Ghana
Virtual Forums
- First Hydrological Advisers Forum Region I - Africa, 16 June 2020

RA II - Asia
Working Group on Hydrology
- 2019 Meeting of RA II WGHS (7-9 October 2019)
- 2018 Meeting of RA II WGHS (26-28 November 2018)
- First Meeting of RA II WGHS (17-19 October 2017)
- Third Meeting of RA II WGHS (25-27 October 2016)
- Second Meeting of RA II WGHS (14-16 April 2015)
- First Meeting of RA II WGHS (30 September - 2 October 2014)
- Report of the RA II WGHS Session, 29-30 March 2007, Beijng, China
Virtual Forums
- First Hydrological Advisers Forum Region II - Asia, 11 September 2020

RA III - South America
Working Group on Hydrology
- Segunda Reunión Conjunta de los Grupos de Trabajo de la AR-III: Hidrología (GT-HRH), Clima (GT-CL) e Infraestructura y Desarrollo Tecnológico (GT-IDT), 4-6 Octubre 2017, Asunción, Paraguay
- Second joint meeting of the RA III Working Groups on Hydrology (WG-HWR), Climate (WG-CL) and Infrastructure and Technological Development (WG-ITD), 4-6 October 2017, Asunción, Paraguay
- Informe Final GT-HRH Décimo cuarta reunión, 4-6 Octubre 2017, Asunción, Paraguay
- Informe Final Décimo tercera reunión, Grupo de Trabajo sobre Hidrología y Recursos Hídricos, (octubre 2015)
Virtual Forums

RA IV - North America, Central America, Caribbean
Working Group on Hydrology
- Report Eleventh Meeting of RA IV WGH, 23-25 January 2018, Kingston, Jamaica
- Report Tenth Meeting of RA IV WGH, 23 February 2015, San Salvador, El Salvador
- Report Ninth Session of RA IV WGH, 4-7 December 2006, San Salvador, El Salvador
Virtual Forums
- RA IV Virtual Hydrology Forum
- First Hydrological Advisers Forum Region IV, 20 July 2020
- Second Hydrological Advisers Forum Region IV, 5 October 2020

RA V - South-west Pacific
Working Group on Hydrology
- Report Ninth Session RA V WGH , 9-13 November 2015, Brisbane, Australia Final report
- Report Eighth Session RA V WGH , 25-29 November 2013, Christchurch, New Zealand
- Report Seventh Session RA V WGH, 14-18 December 2009, Bandung, Indonesia Final report
- Report Sixth Session RA V WGH, 17-21 October 2005, Nadi, Fiji
- Report meeting of experts on Hydrological needs of small islands, 4-6 October 1999, Nadi, Fiji
Virtual Forums

RA VI - Europe