I worked for one of the Dutch ...

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I worked for one of the Dutch regional water authorities. There they used Lizard FEWS for the collection of water levels. We are the endpoint of several European rivers and we are mostly below sea level. We also collected chemical parameters about pollution, saltness and agricultural pesticides in the system since our much of our land is for agricultural purposes.

https://www.deltares.nl/en/software/operational-water-quality-management-system-delft-fews/
https://www.lizard.net/index.en.html