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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). 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. CONTENTS: 1. Introduction; 2. Test 1: Flooding a disconnected water body; 3. Test 2: Filling of floodplain depressions; 4. Test 3: Momentum conservation over a small obstruction; 5. Test 4: Speed of flood propagation over an extended floodplain; 6. Test 5: Valley flooding; 7. Test 6: Dambreak; 8. Test 7: Rainfall and point source surface flow in urban areas; 9. Test 8: Overland flow in a four-branch junction; 10. Test 9: Rainfall-runoff in a three-slope 1D channel; 11. Test 10: Rainfall-runoff over a simplified V-shaped valley; 12. Test 11: Rainfall-runoff over a simplified urban configuration; 13. References.