Modelling river pothole-formation by calculation

The new ELI continues our maths in ELIs theme: 'A bucket for a pothole: visualising past processes by calculation; modelling river pothole-formation by calculation – thinking through the assumptions'.

River potholes like the ones shown in the photos above are thought to have been formed by abrading gravel moved by eddies in the water as it flows over the bedrock. This activity seeks to mimic this mode of formation in order to provoke calculation and discussion around the processes involved.
Many more activities to do with rivers and river erosion can be found on the website.