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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



  • 22
    21712235 21712235 21712235 replied 11 Days ago.

    Interaction D-Waq and D-Part

    3 Posts 943 Views 0 Answers
  • ZW
    Zhanxian Wang replied 9 Months ago.

    suspended sediment and salinity from FLOW to WAQ?

    4 Posts 1544 Views 1 Answer
  • ST
    Serene Tay, modified 11 Months ago.

    Spatial wind input in d-particle track

    1 Post 949 Views 0 Answers
  • xia wei replied 8 Months ago.

    Vegetation Decomposition Parameters

    4 Posts 3150 Views 1 Answer
  • VY
    veli yumruktepe replied 4 Years ago.

    Substance files

    15 Posts 15165 Views
  • SR
    Shivanesh Rao replied 12 Hours ago.

    delwaq time-step relative to telemac timestep

    5 Posts 46 Views
  • YL
    Yuanyi Li replied 5 Days ago.

    How to incorporate a new processes into the library?

    15 Posts 215 Views
  • YX
    yu jia xin, modified 8 Days ago.


    1 Post 53 Views
  • YX
    yu jia xin replied 8 Days ago.

    "merging com files ..restarted hydrdynamic files...particle tracking"

    3 Posts 150 Views 0 Answers
  • 22
    21712235 21712235 21712235, modified 11 Days ago.

    Hello, everyone, after using parallel computing flow module, I chose to cal

    1 Post 57 Views 0 Answers
  • 22
    21712235 21712235 21712235, modified 11 Days ago.


    1 Post 48 Views
  • Michelle Jeuken replied 21 Days ago.

    Delwaq2 NaN value for continuity-check

    2 Posts 120 Views
  • Michelle Jeuken replied 1 Month ago.

    Temperature in HD and WQ

    6 Posts 334 Views
  • Rudy Schueder replied 3 Years ago.

    Erroneous spikes in BLOOM-related parameters in morning and evening

    5 Posts 3454 Views 1 Answer
  • AM
    Arjen Markus replied 1 Month ago.

    Particle Tracking

    4 Posts 256 Views 0 Answers
  • GS
    Gholamreza Shiravani replied 1 Month ago.

    Error Delwaq2 by increasing the number of Processors

    3 Posts 143 Views
  • GS
    Gholamreza Shiravani replied 2 Months ago.

    Error delwaq1 in BLOCK-7

    8 Posts 431 Views
  • Michelle Jeuken replied 2 Months ago.

    Source code for ddcouple

    4 Posts 342 Views
  • GS
    Gholamreza Shiravani replied 2 Months ago.

    Using ddcouple

    3 Posts 3095 Views 0 Answers
  • AM
    Arjen Markus replied 2 Months ago.

    child killed: unknown signal

    2 Posts 179 Views
Showing 1 to 20 of 190 entries.