Hortonian overland flow – if you have ever followed a hydrology class, you have certainly come across this jargon: this is the name of a hydrological process – when rainfall flows off at the terrain surface because the rainfall intensity is so high that not all the water can infiltrate into the soil (rainfall intensity is higher than infiltration capacity). Almost every hydrological m ...[Read More]
It’s hard to overstate the importance of so-called “rainfall frequency analysis,” or the estimation of rare rainfall probabilities such as the 100-year storm. Billions of euros worth of infrastructure and planning decisions are made every year around the world based on such statistics. Unfortunately, extreme short-duration rainfall—meaning very high rainfall rates over a few minutes to a few hour ...[Read More]
After the wet December 2023, the year 2024 started with widespread flooding in parts of Europe. Flooding during winter times is not unusual but brings particular challenges in terms of spatial extent, and the impact on people can be exacerbated when flooding comes with very low temperatures. The exceptionally wet and warm winter necessarily triggers questions from the public about how this links t ...[Read More]
What a strange summer! Depending on where you live, you might currently be suffering from heat. In Switzerland, we are suffering from an exceptionally rainy and stormy weather situation, with high to very high flood danger issued for many major rivers and lakes (see warning map above, taken from the Federal Office for the Environment FOEN on Wednesday 14 July). For certain rivers, controlled flood ...[Read More]
