September 6 - 8, 2021


Followed by the Hydrological Days Conference

UPDATE: R workshop details added and deadline for full paper text submission extended

Ladies and gentlemen,
we would like to invite you to the XXIX Conference of the Danubian countries. The Conference will focus on hydrological topics and current research needs in the Danubian region.

In response to the current pandemic situation and the associated measures we have decided to organize the conference virtually. Should the situation this year allow it, it would also be possible to attend the conference in person (in The Open gardens in Brno, Czech Republic).

The Conference of the Danubian Countries will be followed by the Conference of Czech and Slovak hydrologists “Hydrologické dny” (Hydrological Days), held on September 9, 2021. It is possible to attend both conferences. More information can be found at

Conference topics

Current state-of-the-art hydrological bases of water management at the Danube River

In Europe and developed countries in general, instrumental hydrological data are quite common, while in developing countries the benefits of instrumental data cannot be fully exploited. However, even in the case of higher amount of traditional instrumental data (e.g. times series spanning maximally several hundreds of years), many aspects cannot be completely understood without data covering wider areas. Especially, freely available remote sensing data are becoming more and more utilized in order to get a better idea of hydrological parameters variability over larger areas. Apart from spatial information, also information about past variability is currently intensively studied using different proxies such as the historical records of priceless importance to hydrologists. Thus, in hydrology, it is necessary to develop and maintain so-called data rescue practices, which are in different stages in the Danubian countries. Last but not least, hydrological services are currently equipped by new measuring instruments and the measurement homogeneity must be ensured. Therefore, aside from new methodologies emerging, also data homogeneity throughout the region should be discussed in this section, and the region of the Danube basin is not an exception, not only because of its traditional importance as one of the most largest rivers in Europe having its typical interrelationships with society, but also due to a long-term transnational cooperation among hydrologists and water managers (especially under the umbrella of IHP Danube) regarding the river and its basin which resulted in several valuable and unforgettable outcomes (e.g. monographs on water balance or floods), upon which experts should build further development in the region, possibly applicable also outside the basin.

Possible subtopics:

  • Data: traditional & emerging, measurement, management & analysis
  • Situation of the hydrological gauge network
  • IHP Danube Monographs
  • IHP Danube as the basis for transboundary scientific cooperation with a continuous operational and research work for decision makers
  • Vision, mission and work plan of IHP Danube

New developments in hydrological forecasting and enabling hydrological work in the Danube catchment

Possible subtopics:

  • DAREFFORT: Danube River Basin Enhanced Flood Forecasting Cooperation

    The DAREFFORT project has been devoted to improving the hydrological forecasting systems within the Danube basin and to exchanging the information between the hydrologists in the region. This section will be open to the presentation of any such projects with the aim of transferring the knowledge within the hydrological community in the Danube River basin.

  • R language for hydrology (workshop)

    With reference to Slater et al (2019), it can be said that R is undoubtedly increasingly used free statistical software within hydrological community, which has been recently documented by several workshops organized during important hydrological meetings or even general assemblies. Not only young hydrologists who need to master various aspects of computational hydrology use this software. R has a great potential also for senior professionals. This fact is supported not only by various hydrological papers where a lot of R packages (libraries) are used and cited. Currently, R is employed in many computational areas of hydrology, including water balance and its individual components. Hydrological models have been implemented in different R packages as well. Oftentimes, hydrology needs to be connected with spatial analyses usually carried out in geographical information systems and present the results to stakeholders, policy and decision makers. R integrates all of this, which, finally, inspired the organizers of the conference to arrange the workshop devoted to it in order to show the R power in hydrology of the Danubian countries.

Hydrology for a better understanding of the Danube ecosystem

Many projects were, and still are, conducted relative to the hydrology of the Danube River and its basin. They are carried out under the umbrella of the UNESCO IHP Danube or other permanent bodies such as the ICPDR, and usually supported by the governments of the Danubian countries. However, recently also the European Commission financially supports various projects whose results and gained insights may be helpful to hydrologists affiliated with the UNESCO IHP Danube.

Examples of projects to be introduced:

  • INTERREG project Danube Floodplain
  • INTERREG project Danube Sediment Management
  • INTERREG project Danube Drought Monitor
  • INTERREG project IDES “Improving water quality in the Danube River and its tributaries by integrative floodplain management based on Ecosystem Services”

Learning about hydrological extremes: then, now & in the future

Extremes are one of the main issues addressed in hydrology, while many techniques and methods have been developed in order to soundly support water managers in their efforts to protect the society and various assets from the risk of floods and droughts. From the field of physics, it is well known that with rising air temperature the atmosphere can contain more water, which may result in droughts and low flows on the one hand, whereas, after exceeding some threshold, in rainstorms and torrential rainfalls on the other hand. Therefore, the main focus of this section is to compare frequency and magnitude of the hydrological extremes within different time periods, to study the changes and to look at the future patterns expected in the Danube basin when exploiting climate models.

Bridging the science-policy gap in the Danube catchment: the role of IHP Danube and its partners

Although many hydrological activities are done in the Danube basin, and, nowadays, many of them are performed on the transboundary basis while being supported by the governments, it may happen that individual participants do not know properly about these activities and their results. Therefore, the aim of this section is to gather together the experts representing various intergovernmental bodies working in the field of hydrology and water management in the Danube basin from a long-term point of view, and focus on the activities which may be mutually beneficial. Also, the aim is to focus on not duplicating similar activities within individual bodies and, rather, to focus on effective future cooperation between UNESCO IHP Danube and the other bodies.

  • Partner statements and panel discussion with e.g. UNESCO, WMO, GWP CEE, ICPDR, DC, Sava Commission, IAD, FRIEND-Water Europe, ERB

R workshop

Introduction for beginners (morning session; 2 hours long)

moderators/lecturers: Ondrej Ledvinka, Lovrenc Pavlin, Vojtech Svoboda (visualizations), Klaudija Lebar (visualizations)

specific topics: introduction to R, data input/output/manipulation/basic visualization, statistical models

specific topics 2 (if time permits, only a brief showcase): pipe operator, more advanced data wrangling, local vs. remote (database) tables

required packages: ‘tidyverse’ package ecosystem including ‘ggplot2’

Analysis of hydrological time series (morning session; 2 hours long)

moderators/lecturers: Miriam Bertola, Ross Pidoto, Mojca Sraj; Klaudija Lebar (visualizations), Vojtech Svoboda (visualizations)

specific topics: flood frequency analysis, copulas, nonstationary analysis, time series visualization

required packages: ‘nsRFA’, ‘extRemes’, ‘lubridate’, ‘copula’, ‘ggplot2’; for time-series feature extraction, see the list in Papacharalampous et al. (2021)

Spatial analysis (afternoon session, 2 hours long)

moderators/lecturers: Juraj Parajka, Ross Pidoto, Ondrej Ledvinka

specific topics: working with vector and raster data within R, spatial interpolation (e.g. different types of kriging), raster algebra, data extraction (for points and polygons), predictive modelling (machine learning), remote sensing images processing, map creation

required packages: ‘gstat’, ‘automap’, ‘rgdal’, ‘sf’, ‘raster’, ‘terra’, ‘caret’, ‘CAST’, ‘sen2r’, ‘tidymodels’ ecosystem, ‘ggplot2’

Hydrological modelling (afternoon session, 2 hours long)

moderators/lecturers: Nejc Bezak, Juraj Parajka, Laura Varga

specific topics: introduction to hydrological modelling in R, GR4J model, HBV model, hydrological model output/simulation aggregation, rainfall data disaggregation

required packages: ‘airGR’, ‘airGRteaching’, ‘TUWmodel’, ‘zoo’; for packages and models benchmarking, see Astagneau et al. (2020)

References and additional literature

Astagneau, P. C., Thirel, G., Delaigue, O., Guillaume, J. H. A., Parajka, J., Brauer, C. C., Viglione, A., Buytaert, W., and Beven, K. J.: Hydrology modelling R packages: a unified analysis of models and practicalities from a user perspective, Hydrology and Earth System Sciences Discussions,, 2020.

Ceola, S., Arheimer, B., Baratti, E., Blöschl, G., Capell, R., Castellarin, A., Freer, J., Han, D., Hrachowitz, M., Hundecha, Y., Hutton, C., Lindström, G., Montanari, A., Nijzink, R., Parajka, J., Toth, E., Viglione, A., and Wagener, T.: Virtual laboratories: new opportunities for collaborative water science, Hydrol. Earth Syst. Sci., 19, 2101–2117,, 2015.

Frías, M. D., Iturbide, M., Manzanas, R., Bedia, J., Fernández, J., Herrera, S., Cofiño, A. S. and Gutiérrez, J. M.: An R package to visualize and communicate uncertainty in seasonal climate prediction, Environmental Modelling & Software, 99, 101–110,, 2018.

Papacharalampous, G., Tyralis, H., Papalexiou, S. M., Langousis, A., Khatami, S., Volpi, E., and Grimaldi, S.: Global-scale massive feature extraction from monthly hydroclimatic time series: Statistical characterizations, spatial patterns and hydrological similarity, Science of The Total Environment, 767, 144612,, 2021.

Skøien, J. O., Blöschl, G., Laaha, G., Pebesma, E., Parajka, J., and Viglione, A.: rtop: An R package for interpolation of data with a variable spatial support, with an example from river networks, Computers & Geosciences, 67, 180–190,, 2014.

Wickham, H. and Grolemund, G.: R for Data Science: Import, Tidy, Transform, Visualize, and Model Data, O’Reilly Media, Boston, 492 pp., 2017.



Posters will be presented in a printed version at the conference site, as well as online at the conference website. Poster will be printed by the conference organizer.

Poster specifications:

  • size: A2 paper
  • format: PDF
  • deadline: Jul 31, 2021

Please upload your PDF poster using the button below. If you run into any problems uploading the file, please contact us at


Important dates

Mar 31, 2021 Deadline for extended abstract submission
Apr 15, 2021 Notification of acceptance
Jul 31, 2021 Deadline for full paper text submission
Jul 31, 2021 Deadline for registration without active participation



Conference Fees

The conference will be virtual, so there is no fee associated with the attendance. In case the situation allows it and you want to attend the conference in person, there would still be no fee, but each attendee must arrange their own accommodation and only basic catering will be available.


Please send the filled-in registration form and extended abstract (if you want to participate actively, which is not necessary for the registartion and in such case please use the template file below to create the abstract) to

Registration form

Abstract template

Young Scientist Award

An expert committee will select best three contributions of young scientists (non-PhD scientists up to 30 years old), which will be awarded (1st place 500 EUR, 2nd place 300 EUR and 3rd place 100 EUR).


Open Garden
Údolní 33, 602 00 Brno-střed

Preliminary schedule

This is just a preliminary general conference schedule. Exact list of presentations and presenters will be updated when available.

9:30 AM 9:45 AM opening session
Hydro Veterans Awards
9:45 AM 12:00 PM Block 1
12:00 PM 1:00 PM lunch break
1:00 PM 3:30 PM Block 2
3:30 PM end of the first day
9:30 AM 9:45 AM opening
9:45 AM 12:00 PM Block 3
12:00 PM 1:00 PM lunch break
1:00 PM 3:00 PM Block 4
3:00 PM Young Scientist Award
closing ceremony
Morning session Introduction for beginners
Analysis of hydrological time series
Afternoon session Spatial analysis
Hydrological modelling

Do you have Questions?

Answers to common questions and practical information.

The conference language is English.

The conference will be virtual, so there is no fee. If the situation allows it next year, it might be possible to attend in person, but in such case everyone has to arrange their own accommodation and only basic catering will be available.

Registration can be done by email, using the conference email address



Jáchym Brzezina © 2021 Czech Hydrometeorological Institute