o:8798 Assimilation method for hydrology models: FEWS Kolubara case study en The role of the flood early warning system is to provide information on forecasted water levels along river reaches obtained using mathematical models. Accordingly, it is necessary to ensure adequate initial conditions of mathematical models for the forecast period. Initial conditions are provided through the assimilation process, where corrections to input data, states, or model parameters are made based on the difference between observed and modeled values in the pre-forecast period. This paper presents the initial testing results of the proposed assimilation method for a hydrological-hydraulic model within the Kolubara Flood Early Warning System, based on solving an optimization problem using a genetic algorithm. flood forecast, assimilation, hydrology, genetic algorithm 2025-12-22T12:50:20.508Z 44 no 46 Luka Stojadinović Jaroslav Černi Water Institute, Belgrade, Serbia 0000-0002-5312-6577 Miloš Milašinović University of Belgrade - Faculty of Civil Engineering, Belgrade, Serbia person 0000-0002-3296-5224 Darko Janjić Public Water Company Srbijavode, Belgrade, Serbia person Nikola Milivojević Jaroslav Černi Water Institute, Belgrade, Serbia person 0000-0001-5330-1219 application/pdf 798310 https://unilib.phaidrabg.rs/o:8798 no yes 18 70 92000004 71A04 15th International Conference on Information Society and Technology, Kopaonik, Serbia, March 9-12 2025 71 83 Information Society of Serbia – ISOS, Belgrade, Serbia 2025