Earlier this month Eelco van der Pal, Laurène Bouaziz (both students from Delft University) and myself traveled to Epen to assist St. Oelbert secondary school with their annual field study. As part of the geography curiculum, students have to estimate the amount of flow that passes a certain point on the river Geul. Streamflow measurements so.
The experiment and accompanying documentation were initally designed by Benjamin Fischer and myself in 2006. It has essentially remained unchanged: students first estimate flow using floats and subsequently with use of a current flow meter. In both cases, they have to measure river width and depths at multiple locations in the streambed. Yes, they’ll get wet. It all adds to the fun.
Usually we take measurements in the morning and try to do the calculations in the afternoon. The outcomes of the two methods usually differ, but the students are always well able to explain. After calculations have finished, we check with the water board what their telemetry system says. This year, the student’s findings were spot on and very near to the official reading (although that my be uncertain, too, of course).
A report of an earlier visit can be found here. The school set up a web site showing some pictures. Costs of our contributions are carried by Delft University of Technology and by Deltares. Many thanks to both, and also to Ad Vermeulen at St. Oelbert for inviting us!