SOBEK is a powerful modelling suite for flood forecasting, optimisation of drainage systems, control of irrigation systems, sewer overflow design, river morphology, salt intrusion and surface water quality. The modules within the SOBEK modelling suite simulate the complex flows and the water related processes in almost any system. The modules represent phenomena and physical processes in an accurate way in one-dimensional (1D) network systems and on two-dimensional (2D) horizontal grids. It is the ideal tool for guiding the designer in making optimum use of resources.

Please note that Deltares is working to integrate and improve the hydro software. Important technological innovations make up the new Delft3D FM Suite 1D2D and Delft3D FM Suite 2D3D for integral simulations. The Delft3D FM Suite 1D2D will be the aggregated successor of SOBEK in due time.

Fields of application

SOBEK is a modelling suite designed for water authorities and water management consultancies. Is is suited for modelling and analysis of:

  • Irrigation and drainage systems / rural systems: open channel hydraulics
  • River systems
  • Sewerage and urban drainage systems (closed conduits, pipe flow)
  • Inundation and flooding scenario simulations
  • Water quality predictions
  • and the design and optimization of control systems for canal and waterway automation


SOBEK has been developed jointly with Dutch public institutes and governmental organisations, research institutes, universities and private consultants all over the world.

Integrated approach

SOBEK offers one software environment for the simulation of all management problems in the areas of river and estuarine systems, drainage and irrigation systems and waste water and storm water systems. This allows for combinations of flow in closed conduits, open channels, rivers overland flows, as well as a variety of hydraulic, hydrological and environmental processes.

Powerful simulation engine

The hydrodynamic 1D/2D simulation engine is the computational core of SOBEK. This engine allows the combined simulation of pipe, river-, channel- and overland flow through an implicit coupling of 1D and 2D flow equations. SOBEK is the ideal tool for studying the effects of dam breaks, river floods, dike breaches, urban flooding etc.

Robust numerical operations

The hydrodynamic 1D/2D simulation engine is equipped with a very robust scheme for numerical computation. It also guarantees mass conservation, even in case of transitions through suddenly varying cross section shapes. The engine combines computations of subcritical and supercritical flow, at scales selected by the user. It handles flooding and drying of channels without the use of artificial methods such as the Preissmann slot.

Numerical efficiency

The hydrodynamic 1D/2D simulation engine has a very efficient numerical solution algorithm. The algorithm is based upon the optimum combination of a minimum connection search direct solver and the conjugate gradient method. It also applies a variable time step selector, which suppresses the waste of computational time wherever this is feasible.

Size of models

The size of the model is only limited by the size of the internal memory of the computer used.

Technical specifications

System requirements

Operating Systems (64-bit only):

  • Windows Server 2016
  • Windows 10
  • Windows 11 (version 22H1)

Minimum hardware specifications:

  • 1.5 GHz Intel Core processor or equivalent
  • 2 GB RAM
  • 2 GB of free hard disk space
  • A graphics adapter with 128 MB of video memory and screen resolution of 800 × 600

Desired hardware specifications:

  • 3 GHz Intel Core processor or equivalent
  • 6 GB RAM, 64-bit Windows operating system
  • 20 GB of free hard disk space
  • A graphics adapter with 256 MB of video memory and a screen resolution of 1024 × 768

* SOBEK is a standalone application and is not designed to run as a multi-user application in a Remote Desktop Services or similar environment.

How to get SOBEK?

The latest fully validated SOBEK Suite is version 2.16.004. This version is available via our SOBEK Service Packages. You can easily order these products via and then download the software via our Download portal.

Service Packages

Deltares offers high quality services to consultancy firms, governmental organisations, research institutes and universities worldwide. Several SOBEK service packages, including fully validated high quality SOBEK distributions, are available to suit your specific needs!

Share this page.