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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



  • SZ
    Stephanie Zeunert replied 4 Years ago.

    Settling of algae on the sediment

    5 Posts 2613 Views 1 Answer
  • VY
    veli yumruktepe, modified 4 Years ago.

    Grazing of Phyto

    1 Post 1705 Views
  • Christophe Thiange replied 4 Years ago.

    "Wash-out" of initial conditions for certain constituents

    9 Posts 4050 Views 1 Answer
  • VY
    veli yumruktepe replied 4 Years ago.

    ECO run problem

    5 Posts 2659 Views
  • Javier García Alba replied 4 Years ago.

    How to create the pointer***.asc file

    9 Posts 4074 Views
  • AR
    Alonso Rodríguez Benítez replied 4 Years ago.

    Delft3D-WAQ. Different dispersion for each cell

    8 Posts 4121 Views 1 Answer
  • FA
    Fernando Aguilar replied 4 Years ago.

    Dissolved Oxygen > Saturation

    20 Posts 6361 Views
  • Qinghua Ye replied 4 Years ago.

    Run problem on an HPC machine

    6 Posts 2642 Views 0 Answers
  • AA
    Amelia Araujo replied 1 Year ago.

    How Ulva are defined in WAQ

    6 Posts 3443 Views 1 Answer
  • Rudy Schueder replied 4 Years ago.

    Changing an existing process in ECO process library

    6 Posts 3668 Views 0 Answers
  • Mathieu Chatelain replied 4 Years ago.

    Modelling sediments for Algae BLOOM

    7 Posts 4079 Views
  • Mathieu Chatelain replied 4 Years ago.

    Ambient temperature, water temperature, and ambient natural background temp

    4 Posts 4830 Views 1 Answer
  • Mathieu Chatelain replied 4 Years ago.


    16 Posts 7662 Views
  • AM
    Arjen Markus replied 4 Years ago.

    Format of time series file for import

    5 Posts 5238 Views 3 Answers
  • AM
    Arjen Markus replied 4 Years ago.

    WAQ- Coupling

    2 Posts 2063 Views 0 Answers
  • LH
    Li Haijun replied 4 Years ago.

    Delft-WAQ General Suspended Sediment Model

    3 Posts 3387 Views 1 Answer
  • VY
    veli yumruktepe replied 4 Years ago.

    NH4-NO3 uptake fraction

    3 Posts 3233 Views
  • MA
    Matthew Adams replied 3 Years ago.

    Configuration of process library

    16 Posts 11424 Views 1 Answer
  • Michelle Jeuken replied 2 Years ago.

    Decay rate in PART program.

    5 Posts 4027 Views 1 Answer
  • GP
    Gisli Steinn Petursson replied 4 Years ago.

    space varying time dependent input data

    4 Posts 5154 Views 1 Answer
Showing 141 to 160 of 207 entries.