DELWAQ is the engine of the D-Water Quality and D-Ecology programmes of the Delft3D suite. It is based on a rich library from which relevant substances and processes can be selected to quickly put water and sediment quality models together.

The processes library covers many aspects of water quality and ecology, from basic tracers, dissolved oxygen, nutrients, organic matter, inorganic suspended matter, heavy metals, bacteria and organic micro-pollutants, to complex algae and macrophyte dynamics. High performance solvers enable the simulation of long periods, often required to capture the full cycles of the processes being modelled.

The finite volume approach underlying DELWAQ allows it to be coupled to both the structured grid hydrodynamics of the current Delft3D-FLOW engine and the upcoming D-Flow Flexible Mesh engine (1D-2D-3D) of the Delft3D Flexible Mesh Suite (or even other models such as TELEMAC).

'DELWAQ in open source' is our invitation to all leading experts to collaborate in further development and research in the field of water quality, ecology and morphology using Delft3D. Feel free to post your DELWAQ related questions or comments in this dedicated forum space. If you are new to DELWAQ, the tutorial (in the user manual) is a good place to start. A list of DELWAQ related publications is available here.




Sub groups
D-Flow Flexible Mesh

Cohesive sediments & muddy systems


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Problem with coupling a ddb file

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Problem with coupling a ddb file
ddcouple delwaq
Answer (Unmark)
3/15/17 3:08 PM

I have a problem with coupling a ddb file. when I open ddb file stop time and time step are different from the related files. stop time is shorter and step time is 4 hrs however in 3 related hyd file they are 2s. Anyway I coupled that ddb file but when I opened that file in the Define input-Hydrodynamics it says there is a problem with discharge. what should I do? do you have any idea what is the problem?

Best Regards,
RE: Problem with coupling a ddb file
Answer (Unmark)
3/23/17 5:00 PMas a reply to fateme Mahyari.
Hi Fateme,

Your description is quite general. Is this a 'classic' dd calculation with separate grids? Then it might be that the WAQ output period and intervals might be set differently across the domains. These settings must be the same for all domains. With 'parrallel' dd running (only one grid) it should be the same for all grids automatically