WMO Expert Group “ET Hydrometry” Meets in Vienna

Group photo with 14 people, the Danube can be seen in the background.
© BAW/IWB

The international group “ET Hydrometry” develops important guidelines and manuals for hydrometry, which are made freely available via the WMO website. In addition, the group is involved in innovation support programs such as the HYDRO Hub and in building the capacity of national hydrological services, for example by promoting training and intercomparison measurements.

Silke Kainz from the Institute for Hydraulic Engineering and Hydrometry is a member of the group and hosted the face-to-face meeting in Vienna from 30 June to 2 July 2025.
Highlights of the three-day intensive session included the development of the work plan, international technical exchange, a guided tour of the institute’s hydraulic engineering laboratory, and participation in the 30th anniversary celebration of the Federal Agency for Water Management at the Palmenhaus.

Examples of Well-Known WMO Publications in the Field of Hydrometry

  • Guide to Hydrological Practices, Volume I: Hydrology – From Measurement to Hydrological Information (WMO-No. 168)
    Comprehensive guide on measurement methods, data processing, and hydrological information.
  • Guide to Hydrological Practices, Volume II: Management of Water Resources and Applications (WMO-No. 168)
    Focus on water resources management and the application of hydrological data.
  • Manual on Stream Gauging, Vol. I & II (WMO-No. 1044)
    Volume I: Fieldwork, Volume II: Discharge computation.
  • International Glossary of Hydrology (WMO-No. 385)
    Contains over 1,500 hydrology terms with definitions in English, French, Spanish, and Russian.
  • Guidelines for the Assessment of Uncertainty for Hydrometric Measurement (WMO-No. 1097)
    Evaluation of uncertainties in hydrometric measurements.

These and other documents are available for free download at the following link: Overview