D-Water Quality

The D-Water Quality module, as the successor of Delft3D-WAQ, simulates the far- and mid-field water and sediment quality due to a variety of transport and water quality processes. To accommodate these, it includes several advection diffusion solvers and an extensive library of standardized process formulations with the user-selected substances. Default processes allow you to simulate for instance the decay of BOD and nitrification, elementary growth of algae and nutrient cycling, exchange of substances with the atmosphere, adsorption and desorption of contaminant substances and the deposition and resuspension of particles and adsorbed substances to and from the bed. Deltares’ unsurpassed level of knowledge in the field of water quality is made available to the professional world by means of this module. The D-Water Quality module is also available as add-on for TELEMAC users. D-Water Quality is including the D-Water Quality Open Processes Library. This is an open system to define additional substances, processes acting on new and existing substances, additional coefficients to be used in the formulae, the external forcing and auxiliary output. DELWAQ is the engine computational engine of the D-Water Quality module. For grid aggregation we offer a powerful tool called DIDO.

Delft3D FM beta testing – research programme

The 1D and the 3D part of the D-Water Quality module are available under our prerelease software licensing conditions and within our beta testing – research programme only. For our beta testing – research programme, please contact software@deltares.nl.


Delft3D Flexible Mesh - D-Water Quality - Western Scheldt

D-Water Quality – Western Scheldt


D-Sediment Transport

This sub-module of D-Water Quality simulates the transport, erosion and settling of cohesive and non-cohesive, organic or inorganic, suspended or bed sediments. The module includes several standard transport formulae and considers different particulate fractions independently. The effect of changes in bottom topography is neglected, so that only short-term transport can be assessed. As sediment is a dominating factor in water quality and ecology studies, the inclusion of Deltares’ leading edge knowledge of sedimentation and silt transport processes makes this module the vital base tool for a large range of environmental studies.



A variety of algae growth and nutrient dynamics models have been incorporated into this sub-module of D-Water Quality. For instance, models describing the governing processes of biotic and abiotic ecosystems and the interaction between these have been inserted into the process library, all of which are relevant to the study of eutrophication phenomena. This sub-module includes all algae connected water quality processes considered in the D-Water Quality module plus a variety of more detailed processes.