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The most intense floods occurred in Romania in the Siret river basin, more precisely, the Bistrita river basin. To minimize the risk of flooding, especially in areas that are not yet inhabited, it is, therefore, necessary to urgently draw up risk maps. In the present study, flood maps were drawn up for different probabilities and with a high degree of accuracy with the help of the ISIS (Integrated Spectrographic Innovative Software) modeling program, which was used as a system for modeling specialized issues of flood risk management. The hydraulic modeling uses the ISIS software products to control the hydrodynamics. To create the model with a reduced degree of error, topographical measurements were effectuated in the sectors, most frequently affected by floods. In the year 2015, the topographical surface was scanned using the LiDAR (Light Detection and Ranging) system.