Abstract: In the traditional flood regulation calculation for small watershed tailings ponds，to ad⁃ dress the issues of single solution，cumbersome operation，low efficiency，and susceptibility to human fac⁃ tors in terms of accuracy，a system integrating multiple methods of flood regulation calculation for small wa⁃ tershed tailings ponds has been developed. This system combines the reasoning formula method and the comprehensive unit line method in flood calculation，enabling automatic generation of the incoming flood process line. In the flood regulation calculation process，iterative method and semi-graphical method are integrated to achieve coupled calculation of the incoming flood process line and the discharge process line. In the system，only the basic parameters of the tailings ponds and the local hydrological manual parameters need to be input to complete the calculation，and results such as process line diagrams，key parameter ta⁃ bles，and detailed calculation tables can be output. The system also supports visual presentation. Engineer⁃ ing examples have verified that the results of the two flood calculation methods and the two flood regulation calculation methods within the system are highly consistent，with relatively small relative errors compared to manual calculations. The single flood regulation calculation of the system takes less than 10 s，signifi⁃ cantly improving work efficiency and meeting the needs of pre-flood flood regulation calculation and emer⁃ gency dispatch for small watershed tailings ponds，providing a practical tool for their flood prevention and safety management.

Key words: tailings pond, flood regulation calculation, flood calculation, water balance method