关键词: 排土场, 截洪沟, 洪峰流量, 汇水面积, 降雨强度, 径流系数

Abstract: The flood interception ditch is the core structure of the mine dump for flood control and di‐ saster reduction. The key parameters such as the section size directly depend on the calculation results of the flood peak flow. The numerical values obtained by different calculation methods are obviously differ‐ ent，which is directly related to the safety and design economy of the dump project. It is of great signifi‐ cance to screen and adapt the calculation method to ensure the stability of the dump and control the proj‐ ect cost. Taking a first-class dump in the southern mountainous area as an example，according to the cur‐ rent design code of mine dump，four commonly used methods，including simplified reasoning formula method，empirical formula method of Chinese Academy of Water Sciences，empirical formula method of Highway Research Institute and regional empirical formula method，were selected to calculate the flood peak flow for two typical catchment areas of 1.5 km2 and 4.0 km2 ，and the applicability and calculation de‐ viation of each method were compared and analyzed. The results show that when the catchment area is less than 3 km2 ，the calculation deviation of the simplified reasoning formula method，the empirical formula method of the Chinese Academy of Water Sciences and the regional empirical formula method is small， which is in line with the actual situation of the site and can verify the accuracy of the guarantee. When the catchment area is greater than 3 km2 ，the regional empirical formula method and the empirical formula method of the Chinese Academy of Water Sciences are recommended，and the simplified reasoning formula method is used for verification. The results of the empirical formula method of the Highway Research Insti‐ tute are conservative and have large deviations. It is only suitable for simple emergency calculations when there is a lack of local hydrological data. Although it is safe，it is easy to increase costs. This study clarifies the scope of application of various methods，which can provide reference for the design of flood intercep‐ tion ditch in dump，help designers to select on demand，and take into account the safety and economy of the project.

Key words: dump, flood interception ditch, flood peak flow, catchment area, rainfall intensity, run‐ off coefficient