The test assesses students understanding of the features in the upper, middle and lower courses of the river. (tes.com)
But according to the European Water Framework, deviating the natural course of a river can only be done in the case of «projects of public utility» and of «overriding public interest». (blog.politics.ox.ac.uk)
The team were also able to determine where the original material in the river came from by dating mineral grains such as zircon and mica, revealing the previous course of the river. (sciencedaily.com)