Abstract: To enhance flood risk prevention and control capabilities, there is an urgent need to establish a scientific and precise flood control dispatch system. The development of such a system serves as a critical tool for achieving accurate and scientific regulation of water projects, including reservoirs. This study introduces an efficient and flexible r basinal flood control dispatch system, which is developed by using a multi-tier B/S architecture, integrated with component-based technologies such as Vue, Node.js, and ElementUI. The system enables universal configuration of flood control dispatch models and flexible delineation of dispatch boundaries. It supports simulation calculations for various flood dispatch methods, including rule-based dispatch, optimized dispatch, directive dispatch, and non-retention strategies. Successfully applied to flood control dispatch of water projects in Shandong Province’s Dawen River Basin, the system demonstrated its efficacy during multiple rainfall-flood events in the 2024 flood season. Results indicate that the system can rapidly compute flood control outcomes under diverse dispatch scenarios, providing precise and efficient technical support for real-time decision-making in basin-scale water project management. The system shows significant potential for broader application in flood control dispatch practices across other river basins.