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The artificial island project of the Hongkong-Zhuhai-Macao Bridge is situated in a location prone to year-round exposure to extreme weather events such as tropical cyclones and typhoons, often accompanied by prolonged heavy rainfall when typhoons pass through. To mitigate operational risks of the tunnel under such extreme and adverse conditions, a local physical model test was conducted to verify the water interception capacity of the transverse ditch grate on the open section of the artificial island. The influence of grid angle, opening ratio, road slope, scale effects, and the number of transverse ditch on the water interception capacity of the grate were studied. The results indicate that the water interception capacity of the grate in the design with a 0° grid angle surpasses that of the 90° grid angle. Simultaneously, the arrangement of two transverse ditches demonstrates a significant water interception effect. The findings of this research are of great significance for the accuracy of the design and layout of the transverse ditch grates on the artificial island, the elimination of drainage hazards, risk prevention, and ensuring operational safety. [ABSTRACT FROM AUTHOR]