Water data in the Netherlands are available via Rijkswaterstaat webservices. In short, there are two web services
This package aims to provide functions to easily connect to this service and download water-related data.
It is under development
documentation of services: https://www.rijkswaterstaat.nl/rws/opendata/DistributielaagWebservices-SUM-2v7.pdf
The package is maintained by willem.stolte(at)deltares.nl
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