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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



  • ZW
    Zhanxian Wang replied 3 Months ago.

    suspended sediment and salinity from FLOW to WAQ?

    4 Posts 557 Views 1 Answer
  • ST
    Serene Tay, modified 5 Months ago.

    Spatial wind input in d-particle track

    1 Post 487 Views 0 Answers
  • xia wei replied 2 Months ago.

    Vegetation Decomposition Parameters

    4 Posts 2246 Views 1 Answer
  • VY
    veli yumruktepe replied 3 Years ago.

    Substance files

    15 Posts 13136 Views
  • AA
    Amelia Araujo, modified 15 Days ago.

    RadSurf file in BLOOM

    1 Post 122 Views
  • AA
    Amelia Araujo replied 17 Days ago.

    DELWAQ Conversion NEFIS to NetCDF

    15 Posts 5450 Views 1 Answer
  • AA
    Amelia Araujo replied 24 Days ago.

    delwaq1 error reading block 5

    41 Posts 2091 Views 1 Answer Locked
  • AM
    Arjen Markus replied 3 Months ago.

    Spatially Varying Reactions

    2 Posts 350 Views 1 Answer
  • AM
    Arjen Markus replied 3 Months ago.

    DELWAQ coupled with z-layer Delft3D FLOW model?

    8 Posts 665 Views 1 Answer
  • AM
    Arjen Markus replied 3 Months ago.

    confusing paragraph on Page 59 of the D-Water Quality User Manual

    3 Posts 300 Views
  • Michelle Jeuken replied 3 Months ago.

    How to do water balance check and how to calculate thermal water fraction

    10 Posts 750 Views 2 Answers
  • Michelle Jeuken replied 3 Months ago.

    run DELWAQ on a cluster?

    7 Posts 674 Views 1 Answer
  • Fatemeh GholamiMahyari replied 4 Months ago.

    Need help for applying D-Water Quality on 0D

    3 Posts 721 Views 0 Answers
  • Santiago Montes replied 4 Months ago.

    Error with statistical output function STAPRC

    3 Posts 659 Views
  • Michelle Jeuken replied 4 Months ago.

    Error message: Improper version of watqual.d3d and proctabl.d3d

    5 Posts 864 Views 1 Answer
  • AM
    Arjen Markus replied 6 Months ago.

    Illegal option for reaeration formula

    5 Posts 842 Views
  • Michelle Jeuken replied 7 Months ago.

    Trouble in modeling NO3 in a wastewater pond

    7 Posts 1015 Views
  • Amr Salama replied 8 Months ago.

    Sediment Water Interaction

    5 Posts 1257 Views 1 Answer
  • Michelle Jeuken replied 9 Months ago.

    about waq (1) execution error...

    3 Posts 884 Views 0 Answers
  • Ana Costa replied 9 Months ago.

    Aggregating new substances' processes with Delft3D-WAQ

    3 Posts 902 Views 0 Answers
Showing 1 to 20 of 177 entries.