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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



  • AA
    Amelia Araujo replied 1 Year ago.

    How Ulva are defined in WAQ

    6 Posts 3342 Views 1 Answer
  • Rudy Schueder replied 4 Years ago.

    Changing an existing process in ECO process library

    6 Posts 3600 Views 0 Answers
  • Mathieu Chatelain replied 4 Years ago.

    Modelling sediments for Algae BLOOM

    7 Posts 3980 Views
  • Mathieu Chatelain replied 4 Years ago.

    Ambient temperature, water temperature, and ambient natural background temp

    4 Posts 4728 Views 1 Answer
  • Mathieu Chatelain replied 4 Years ago.


    16 Posts 7504 Views
  • AM
    Arjen Markus replied 4 Years ago.

    Format of time series file for import

    5 Posts 5122 Views 3 Answers
  • AM
    Arjen Markus replied 4 Years ago.

    WAQ- Coupling

    2 Posts 2031 Views 0 Answers
  • LH
    Li Haijun replied 3 Years ago.

    Delft-WAQ General Suspended Sediment Model

    3 Posts 3319 Views 1 Answer
  • VY
    veli yumruktepe replied 4 Years ago.

    NH4-NO3 uptake fraction

    3 Posts 3164 Views
  • MA
    Matthew Adams replied 3 Years ago.

    Configuration of process library

    16 Posts 11050 Views 1 Answer
  • Michelle Jeuken replied 1 Year ago.

    Decay rate in PART program.

    5 Posts 3958 Views 1 Answer
  • GP
    Gisli Steinn Petursson replied 4 Years ago.

    space varying time dependent input data

    4 Posts 5060 Views 1 Answer
  • Fatemeh GholamiMahyari replied 2 Years ago.

    Error in startup: delwaq1.exe

    7 Posts 5685 Views 1 Answer
  • AM
    Arjen Markus replied 4 Years ago.

    Restart from a map file, howto

    6 Posts 4275 Views
  • SN
    Sathya narayanan replied 4 Years ago.

    Abnormally high values of Oxygen and NO3 in simulation coupled with Telemac

    3 Posts 2322 Views 1 Answer
  • Michelle Jeuken replied 4 Years ago.

    General Coliform Model references

    12 Posts 4857 Views
  • DP
    David Plew replied 4 Years ago.

    OpenPLCT processes - why are my fluxes depth dependent?

    7 Posts 3227 Views 1 Answer
  • AM
    Arjen Markus replied 4 Years ago.

    Couple TELEMAC-DWAQ : How to Implement Weirs

    18 Posts 5730 Views 3 Answers
  • Michelle Jeuken replied 4 Years ago.

    coupling DELWAQ to UnTRIM

    4 Posts 2349 Views 2 Answers
  • Michelle Jeuken replied 4 Years ago.

    Light extinction due to DOC

    3 Posts 2526 Views
Showing 141 to 160 of 201 entries.