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

Delft-WAQ General Suspended Sediment Model

Li Haijun, modified 6 Years ago.

Delft-WAQ General Suspended Sediment Model

Hi everyone,

I included the "Sediment" process in the Delft-Flow to simulate the concentration of suspended sediment named "Sediment Mud" and it worked well. I could see the spatial distribution of the sediment concentration with QUICKPLOT.

The manual says that "the General Suspended Sediment Model" in the Delft-WAQ could simulate the suspended sediment too. However, when I used the susbstance file "sed_1fraction_04.sub" in the Delft-WAQ model to do the same simulation in order to see the result of comcentration of sediment,the concentration of IM1 was very different with the Sediment Mud in the results of Delft-Flow!!

I am not so familiar with the WAQ module. Does "IM1" represent the suspended sediment in the Delft-WAQ just as "Sediment Mud" in the Delft-Flow? And how can I adjust the parameters to get the right result of IM1 in the WAQ just as Sediment Mud in the Flow?


Li Haijun
Qinghua Ye, modified 6 Years ago.

RE: Delft-WAQ General Suspended Sediment Model (Answer)

Jedi Council Member Posts: 610 Join Date: 3/2/11 Recent Posts
Hi Li Haijun,

Even though both WAQ and FLOW solve the transport equation, these 2 solvers are different, and they are for different purposes. WAQ didn't have consider bed level change, and flow didn't consider much in the bed layers by default. It is hard to give out the same answer if you didn't set up both models very carefully.

Is this the answer of your question?

Li Haijun, modified 6 Years ago.

RE: Delft-WAQ General Suspended Sediment Model


Thank you for your reply.
I do not know the WAQ model well so far. I will use FLOW more to simulate the sediment transportation.

Li Haijun