Iber is a software for simulating turbulent free surface unsteady flow and transport processes in shallow water flows. The hydrodynamic module of Iber solves the depth averaged two-dimensional shallow water equations (2D Saint-Venant Equations). A turbulent module allows the user to include the effect of the turbulent stresses in the hydrodynamics. These are evaluated with different depth-averaged turbulence models for shallow waters of different complexity. Additional capabilities include sediment transport modelling, water quality modelling and rainfall-runoff modelling. All the equations of the model are solved in a finite volume non-structured mesh made up of triangle and quadrilateral elements. A more detailed description of the model can be found in Bladé et al. (2014) and the references therein, as well as in the documents included in the Refences section of this document. Iber can be downloaded for free through www.iberaula.com. This document presents the performance of the software Iber in a series of two-dimensional modelling benchmark tests. Some of these tests were developed by the United Kingdom Joint Defra / Environment Agency under Defra’s Flood and Coastal Erosion Risk Management R&D program, and have been used to benchmark other 2D free surface flow models, as the 2D version of HEC-RAS. The Defra’s benchmarking report, which includes the comparison of several two-dimensional models, can be downloaded from: https://www.gov.uk/government/publications/benchmarking-the-latest-generation-of-2d-hydraulicflood-modelling-packages