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BONN: German experts have developed an efficient and cheap water sensor that uses solar energy to monitor water flow in rivers. This is especially true in areas prone to frequent flooding. According to a report published in the latest publication of the Journal of Water Resources Research, traditional river flow measurement devices often break in high-velocity flows. It is then impossible to make consistent measurements with most instruments. Although there are modern systems, they are very expensive. Now this unit is not only free from all these defects, but has been working for two years in the lower Rhine. It continuously releases water readings that can be viewed on an app. Due to its low cost, its sensors can be installed in many places for better monitoring of water flow.