Frequently asked questions

How do I set up self-monitoring of my sewerage network in accordance with the decree of 21 July 2015? 

Once your discharge points have been identified and characterised in terms of what is at stake (number of p.e.), 3D EAU is able to diagnose the hydraulic complexity of each site and propose a self-monitoring system adapted to your expectations.

How can a nonconformity in a Venturi flume be remedied nondestructively?

3D EAU is able to remove a non-conformity with the ISO 4359 standard using 3D modelling. Indeed, the tool allows the calibration of a height/flow law specific to the hydraulic environment of the site without the need for any consequent work.

How can the design of a drop shaft or pump tank be optimised? 

Similar to a physical model, a virtual 3D model demonstrates the operation of a structure, before it is built. Depending on the results of the initial design assessment and the optimisation possibilities, modelling makes it possible to test several scenarios and select the best compromise between cost and efficiency.

Does 3D numerical modelling accurately reproduce a real flow?

José Vazquez, a professor at ENGEES and a researcher at the ICube laboratory in Strasbourg, has been exploring this topic for about 20 years. He has supervised about twelve PhD dissertations (all available online) on this subject:
-    Some focused on the development of calculation codes (in 1D: Marc Buyer 2002, Maher Abdallah 2005, Georges Kesserwani 2008; in 2D: Rabih Ghostine 2009, Quentin Araud 2012 and in 3D: Jonathan Wertel 2009, Gilles Isenmann 2016).
-    Others sought to validate 3D calculation codes using measurement data (Gislain Lipeme-Kouyi 2004, Matthieu Dufresne 2008, Laurent Solliec 2013, Vivien Schmitt 2013, Salma Bellahcen 2016).
-    Finally, others focused on the development of methodologies to use these calculation codes in sewer systems (Sandra Isel 2014).

This extensive research has led to the conclusion that a 3D numerical model is capable of accurately reproducing a real water flow for which we seek to determine the position of the free surface (for example to establish a head-discharge relationship) or the distribution of flow between several possible outlets. The velocity distribution can also be modelled if the turbulence model is chosen appropriately. Importantly, these many years of research have also demonstrated that beyond the choice of models, the key step in the numerical 3D modelling of a flow is the initial hydraulic analysis. This means that the dual expertise of 3DEAU, in hydraulics and modelling, is crucial.

However, not everything can be modelled easily. Certain flows—those of viscous fluids, such as mud, or air-water mixtures, such as in a drop shaft—require very specific approaches. The CIFRE PhD dissertations of Nicolas Schaer (2018) and Gabriel Guibu Pereira (2019), conducted at 3DEAU, determined how to model in these very specific contexts.

What are the administrative data associated with 3DEAU?

APE code : 7112B

SIRET number : 801 877 887 00035


TVA : FR14 801 877 887

What tools are available to instrument a simple, low-stake spill facility?

3D EAU provides a web application in order to evaluate the hydraulic complexity of a storm overflow weir and to identify the most suitable height/flow conversion law for each case.


The application is freely available : 

What are the terms and conditions of 3D EAU?