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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 3 Years ago.

    Settling of algae on the sediment

    5 Posts 2502 Views 1 Answer
  • VY
    veli yumruktepe, modified 3 Years ago.

    Grazing of Phyto

    1 Post 1649 Views
  • Christophe Thiange replied 3 Years ago.

    "Wash-out" of initial conditions for certain constituents

    9 Posts 3873 Views 1 Answer
  • VY
    veli yumruktepe replied 3 Years ago.

    ECO run problem

    5 Posts 2518 Views
  • Javier García Alba replied 3 Years ago.

    How to create the pointer***.asc file

    9 Posts 3916 Views
  • AR
    Alonso Rodríguez Benítez replied 3 Years ago.

    Delft3D-WAQ. Different dispersion for each cell

    8 Posts 3994 Views 1 Answer
  • FA
    Fernando Aguilar replied 3 Years ago.

    Dissolved Oxygen > Saturation

    20 Posts 6097 Views
  • Qinghua Ye replied 3 Years ago.

    Run problem on an HPC machine

    6 Posts 2523 Views 0 Answers
  • AA
    Amelia Araujo replied 1 Year ago.

    How Ulva are defined in WAQ

    6 Posts 3229 Views 1 Answer
  • Rudy Schueder replied 3 Years ago.

    Changing an existing process in ECO process library

    6 Posts 3551 Views 0 Answers
  • Mathieu Chatelain replied 3 Years ago.

    Modelling sediments for Algae BLOOM

    7 Posts 3912 Views
  • Mathieu Chatelain replied 3 Years ago.

    Ambient temperature, water temperature, and ambient natural background temp

    4 Posts 4654 Views 1 Answer
  • Mathieu Chatelain replied 3 Years ago.


    16 Posts 7398 Views
  • AM
    Arjen Markus replied 4 Years ago.

    Format of time series file for import

    5 Posts 5044 Views 3 Answers
  • AM
    Arjen Markus replied 4 Years ago.

    WAQ- Coupling

    2 Posts 2005 Views 0 Answers
  • LH
    Li Haijun replied 3 Years ago.

    Delft-WAQ General Suspended Sediment Model

    3 Posts 3263 Views 1 Answer
  • VY
    veli yumruktepe replied 4 Years ago.

    NH4-NO3 uptake fraction

    3 Posts 3102 Views
  • MA
    Matthew Adams replied 3 Years ago.

    Configuration of process library

    16 Posts 10763 Views 1 Answer
  • Michelle Jeuken replied 1 Year ago.

    Decay rate in PART program.

    5 Posts 3875 Views 1 Answer
  • GP
    Gisli Steinn Petursson replied 4 Years ago.

    space varying time dependent input data

    4 Posts 4984 Views 1 Answer
Showing 121 to 140 of 190 entries.