Water quality in the sea especially around the mouths of rivers is greatly affected by the quality of river water bringing polluting agents. The paper presents a possible solution of wireless sensor network for river water quality monitoring. The network has been developed with support of EU as a pilot project. It consists of 10 buoys carrying sensors, short and long distance communication systems and two central control nodes processing sensed data and perform their visualization and storage. Moreover, the central nodes perform SMS and email alerting and administration of whole network. The developed system was tested in river at the Slovak Hungarian border.
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