intro story DELWAQ


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


Message Boards


Nicolás Marcelo Pincheira, modified 2 Years ago.


Youngling Posts: 1 Join Date: 2/27/19 Recent Posts

Dear all,


In the coupling procces for WAQ, this error appear:

NEFIS message 3006:
 Variable dimension 3 not found for:
 group "CURTIM          ", element "TIMCUR          "

  Exit from Delft3D-Coupling


If you can help me. 

Thanks you very much.




Arjen Markus, modified 2 Years ago.

RE: Coupling

Jedi Knight Posts: 223 Join Date: 1/26/11 Recent Posts

This is rather odd - we cannot find a definitive reason why this should be happening. Can you use the tool "VSI" to inspect the file?

Possible causes we can think of are:

- The output for water quality has not been turned on properly

- The period for which the output for water quality is to be written falls outside the period of the flow calculation