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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



  • HJ
    Hirejet John replied 2 Years ago.

    Created 2way-coupling communication file error

    3 Posts 1869 Views
  • Christophe Thiange replied 2 Years ago.

    Discharges in DELWAQ

    2 Posts 1707 Views
  • MA
    Matthew Adams replied 2 Years ago.

    Visualising unstructured grid - TELEMAC hydro and DELWAQ ecological model

    3 Posts 2858 Views 2 Answers
  • Michelle Jeuken replied 2 Years ago.

    Bedload sediment transport

    2 Posts 1618 Views
  • RH
    Rusty Holleman replied 2 Years ago.

    DynDepth and z-layers

    3 Posts 1784 Views
  • DK
    Dmitry Kushnir replied 3 Years ago.

    Setup of sediment water interaction

    2 Posts 1950 Views 0 Answers
  • U
    Anonymous replied 3 Years ago.


    3 Posts 1761 Views 0 Answers
  • Christophe Thiange replied 3 Years ago.

    Problems with nutrient flowing

    4 Posts 2365 Views
  • Michelle Jeuken replied 3 Years ago.

    ZMODEL and generating WAQ-compatible hydrodynamics

    3 Posts 2323 Views 0 Answers
  • Christophe Thiange replied 3 Years ago.

    Load data from the -bal.his file

    2 Posts 2504 Views 0 Answers
  • Christophe Thiange replied 3 Years ago.

    Thatcher-Harleman time lag in WAQ

    2 Posts 4305 Views 0 Answers
  • AT
    Alejo Testa tacchino replied 3 Years ago.

    Setting up DELPAR (D-Water Quality Particle Tracking) simulation from GUI

    7 Posts 6023 Views 0 Answers
  • Javier F Bárcena replied 3 Years ago.

    How to specify several com.* files in process parameter tab?

    5 Posts 4078 Views 1 Answer
  • MA
    Matthew Adams replied 3 Years ago.

    PLCT: File>Open/Import grayed out, File>Save is *.dat instead of *.sub

    9 Posts 6263 Views 2 Answers
  • MA
    Matthew Adams replied 3 Years ago.

    Plots not showing correctly from D Water Quality User Manual tutorial

    5 Posts 3935 Views 1 Answer
  • Yahia Kala, modified 3 Years ago.

    Hot Start problem in DELWAQ

    1 Post 1661 Views 0 Answers
  • SZ
    Stephanie Zeunert replied 3 Years ago.

    Problems with DELWAQ-Output

    3 Posts 3002 Views 1 Answer
  • Zulhafizal Othman replied 3 Years ago.

    Micropollutant modelling

    3 Posts 2116 Views 2 Answers
  • Christophe Thiange, modified 3 Years ago.

    BLOOM algae sedimentation velocities

    1 Post 2499 Views
  • NN
    Nill Ng replied 3 Years ago.

    Stopped with error code: 1

    7 Posts 4285 Views
Showing 101 to 120 of 207 entries.