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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 10 Days ago.

    Interaction D-Waq and D-Part

    3 Posts 936 Views 0 Answers
  • ZW
    Zhanxian Wang replied 9 Months ago.

    suspended sediment and salinity from FLOW to WAQ?

    4 Posts 1541 Views 1 Answer
  • ST
    Serene Tay, modified 10 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 3148 Views 1 Answer
  • VY
    veli yumruktepe replied 4 Years ago.

    Substance files

    15 Posts 15163 Views
  • AM
    Arjen Markus replied 1 Day ago.

    delwaq time-step relative to telemac timestep

    4 Posts 36 Views
  • YL
    Yuanyi Li replied 5 Days ago.

    How to incorporate a new processes into the library?

    15 Posts 192 Views
  • YX
    yu jia xin, modified 7 Days ago.


    1 Post 45 Views
  • YX
    yu jia xin replied 7 Days ago.

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

    3 Posts 141 Views 0 Answers
  • 22
    21712235 21712235 21712235, modified 10 Days ago.

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

    1 Post 51 Views 0 Answers
  • 22
    21712235 21712235 21712235, modified 10 Days ago.


    1 Post 43 Views
  • Michelle Jeuken replied 21 Days ago.

    Delwaq2 NaN value for continuity-check

    2 Posts 117 Views
  • Michelle Jeuken replied 1 Month ago.

    Temperature in HD and WQ

    6 Posts 328 Views
  • Rudy Schueder replied 3 Years ago.

    Erroneous spikes in BLOOM-related parameters in morning and evening

    5 Posts 3452 Views 1 Answer
  • AM
    Arjen Markus replied 1 Month ago.

    Particle Tracking

    4 Posts 253 Views 0 Answers
  • GS
    Gholamreza Shiravani replied 1 Month ago.

    Error Delwaq2 by increasing the number of Processors

    3 Posts 140 Views
  • GS
    Gholamreza Shiravani replied 2 Months ago.

    Error delwaq1 in BLOCK-7

    8 Posts 425 Views
  • Michelle Jeuken replied 2 Months ago.

    Source code for ddcouple

    4 Posts 339 Views
  • GS
    Gholamreza Shiravani replied 2 Months ago.

    Using ddcouple

    3 Posts 3092 Views 0 Answers
  • AM
    Arjen Markus replied 2 Months ago.

    child killed: unknown signal

    2 Posts 175 Views
  • SX
    ShengZhuo Xu, modified 4 Months ago.

    Questions about ERROR NEFIS message 8016

    1 Post 227 Views 0 Answers
  • MD
    meddy danial replied 4 Months ago.

    Boundary conditions

    5 Posts 3590 Views
  • AM
    Arjen Markus replied 4 Months ago.

    Is still Delwaq for one node or already developed for cluster using MPI?

    2 Posts 288 Views
  • Michelle Jeuken replied 5 Months ago.

    Delft Flow-WAQ coupling error

    4 Posts 2270 Views 0 Answers
  • AA
    Amelia Araujo, modified 6 Months ago.

    RadSurf file in BLOOM

    1 Post 863 Views
  • AA
    Amelia Araujo replied 6 Months ago.

    DELWAQ Conversion NEFIS to NetCDF

    15 Posts 7265 Views 1 Answer
  • AA
    Amelia Araujo replied 6 Months ago.

    delwaq1 error reading block 5

    41 Posts 8102 Views 1 Answer Locked
  • AM
    Arjen Markus replied 9 Months ago.

    Spatially Varying Reactions

    2 Posts 948 Views 1 Answer
  • AM
    Arjen Markus replied 8 Months ago.

    DELWAQ coupled with z-layer Delft3D FLOW model?

    8 Posts 2037 Views 1 Answer
  • AM
    Arjen Markus replied 9 Months ago.

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

    3 Posts 965 Views
Showing 1 to 30 of 190 entries.