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Delwaq is the generic Deltares finite volume water quality and ecology solver that has been linked to 1D network models (like Deltares' own SOBEK model) as well as both structured and unstructured 2D and 3D models (like Delft3D, Telemac, ROMS and Untrim). The program has been able to flexibly couple to all these hydrodynamic solvers without any major architecture redesign for over 20 year by strict separation of geometry, topology, quantities and process formulations. In fact, delwaq itself doesn't know anything about the model geometry; although this has been a major advantage, the lack of geometry data on the delwaq binary output files is starting to limit the wider uptake and hence we're looking at options to enable geometry data on the output file without limiting bothering the computational core with irrelevant data on geometric differences between the various hydrodynamic models. A common generic geometric description would be best such that delwaq only has to call a single routine to copy it to the output file. For this purpose we have selected the new proposal for the CF standard CF unstructured grid proposal. What information do we need from the flow module?
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