Researchers studied how prevent-flood dams affect flood retention in rivers. They used mathematical models and observed data to analyze the impact of these dams on flood levels. Results showed that prevent-flood dams can significantly affect the amount of water retained in the main channel during floods. Different types of floods and combinations of river branches have varying impacts on flood levels. Factors like rainfall patterns and land use also play a role in flood formation. Overall, understanding how prevent-flood dams influence flood retention is crucial for managing flood risks in river basins.