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