Issue No. 1, March 2021

Welcome to the first HYPE Newsletter! We share the latest updates and developments to the model code and applications, with an overview of HYPE activities.

Last year presented challenges for us all but in moving online we were able to hold the very first HYPE online conference held in June. We then held the tenth annual HYPE course in September, online for the first time. The course and conference are planned to be held again this year, see page 3 for details.

Wishing you all a happy and safe 2021!

Charlotta Pers:
Latest news in the HYPE code

Multi-basin lakes are improved: Outlet lakes can be assigned to several subbasins, so called Multi-basin lakes. These now have an even water level in all lake basins, and each lake basin is assumed well-mixed. The multi-basin lake can have outlets from several of its lake basins, but the main outlet is located in the most downstream subbasin. The flow between lake basins is calculated to keep the water level equal, and so might therefore flow in both directions between two lake basins.

Current development of surface water and runoff: A new option is the model for local lake connectivity and non-contributing areas. This is used for simulating flat areas with multiple lakes with periodical outflow. River water level output can be calculated smoothly with rating curves for ice and no ice conditions. Optional models for simulating surface runoff for infiltration limited conditions are added. The calculations are based on the relation between current and maximum soil moisture and do not depend on thresholds.

The HYdrological Simulation System (HYSS): is now equipped with routines for ensemble modelling of parameter values, and specific subbasin weight on criteria for performance calculation, as well as updating of outflow with observations for concentrations.

There are more upcoming features!

Check the latest release: Release Notes.
Released features are described on the wiki: HYPE wiki

We have a new tutorial series available!

The 5 tutorials introduce the code structure of HYPE. The videos present HYSS, HYPE and the interface between them: New tutorial series

Kristina Isberg:
Latest news in World-wide HYPE model development

In 2021 we will release a new version of World-wide HYPE: version 1.4. We have been continuously working to improve this model since development began in 2016. In the new version, we have focused on quality assurance for the lake information, so we can implement the last HYPE code version for improving the multi-basin lakes simulations (see “What´s new in the HYPE code”).

The global forcing data, Hydro-GFD (Berg et al., 2020) was extended until 2020 (version 3.2). The new forcing data and the new multi-basin lake code may change the water balance, so the model will be recalibrated before release. World-wide HYPE v 1.4 will be operationalized, provide forecasts, and you will be able to check it out at HYPEweb.

Water quality is now being further implemented in World-Wide HYPE. Sediments are already included but nutrients and chloride is ongoing as well as transport of waterborne plastics to the sea.

For more information about our water quality research focus, see Focus Page.

Model feedback to share? Let us know: Feedback form

The forecast of flood risk around the world in the next 10 days generated by the World-Wide HYPE model. Basins are coloured red, orange or yellow depending on the model results.

First HYPE online conference in 2020

”Learning more about the diverse applications of HYPE … internationally” and “the high scientific level” are only a couple of highlights from participants at the first HYPE Online Conference, held in June 2020.

It was amazing to see the many different ways the model has been used, and to see what past-course participants have been up to! We have a revised format for 2021, and look forward to meeting everyone again.

Water and a bridge
Forty-five participants met online to present and discuss their latest work using the HYPE model in a variety of different applications, covering:
  • J-HYPE – An Introduction of HYPE Application in Japan (H. Tanouchi)
  • HYPE goes on a Canadian holiday! (A. Tefs)
  • Updates of Greater Mekong HYPE Model (GM_HYPE) (B. Duong)
  • The achievements of HYPE model in Senegal (A. Faty)
  • HYPE for Norway – many lakes and even more catchments (L. Schönfelder)
  • WW-HYPE vs. E-HYPE vs. B-HYPE (I.Danilovich)
  • World-Wide HYPE and GlobalHydroPressure (J. Olsson)

Open HYPE course – Online in 2020

We had 27 participants from 15 different countries around the world signing into the new online Open HYPE course format. One participant shared they “particularly liked having so many experts available on-line and the very clear, prompt and knowledgeable answers”, and we were glad to hear that others enjoyed connecting online!
HYPE course 2020
Tweet HYPE course 2020
A tweet of feedback on the 2020 online HYPE course 'I was worried about starting a PhD in such isolating times, however feeling great today to take the Hydrological Predictions for the Environment (HYPE) model course. Thanks @polarbotanist and @Hydro_Research and SMHI for making this virtual workshop so engaging!

The aim of the course each year is to teach those with hydrological modeling experience to use HYPE. You can find information about past courses at courses and training.

Coming up in 2021!​

HYPE Newsletter is written by staff at Hydrological Research and Development unit at SMHI.
For more info, visit

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