intro story DELWAQ


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


Message Boards

Error with statistical output function STAPRC

Santiago Montes, modified 3 Years ago.

Error with statistical output function STAPRC

Youngling Posts: 2 Join Date: 1/11/18 Recent Posts
Hello, I´m trying to use the STAPRC statistical output function without success. In the list file appears the following

“ERROR no critical level specified for percentage”

The input file I´m using includes the two variables the User Manual indicates for this function: THRESH and ABOVE. I can´t figure out what the “percentage” related to this error is.
In case anyone has experience with this function, I copy beneath the tenth block of my input file for some help. Thank you!

; Tenth input block

period 'prueba'
suffix '1d'
start-time '2015/02/01-00:00:00'
stop-time '2015/02/02-00:00:00'

output-operation 'STAPRC'
substance 'EColi'
suffix 'Uso III'
real-parameter 'THRESH' 1000
logical-parameter 'ABOVE' 'yes'

Michelle Jeuken, modified 3 Years ago.

RE: Error with statistical output function STAPRC

Jedi Knight Posts: 154 Join Date: 1/21/13 Recent Posts

I checked the code of this statistical calculation where the error message stems from, and it seams that the manual is wrong on the name of the required parameter. It is not named THRESH but CCRIT for this statistic. I guess it was copied erroneously from the 'geometric mean' which uses a THRESH parameter. I hope you can get it running now with CCRIT.


P.S. I've corrected the manuals on this. It should be published in draft tomorrow on this site (at http://oss.deltares.nl/web/delft3d/manuals) under: Latest draft documents
Santiago Montes, modified 3 Years ago.

RE: Error with statistical output function STAPRC

Youngling Posts: 2 Join Date: 1/11/18 Recent Posts
Thank you Michelle, it works correctly using the parameter CCRIT