The size of the orifice mainly depends on the layout of the spillway, the working conditions of the gate and the requirements of the manufacturing level. According to the characteristics of large peak height of the project, the size of the orifice can be large, but the orifice is limited by the level of gate manufacturing. According to the application and comprehensive consideration of the deep hole gate in this project, it is decided to adopt the orifice size of 5 × 5m. The number of orifices, through the calculation of flood route of various flood discharge layout schemes, 7 bottom orifices are set according to the possibility of hub layout. It is located in seven dam sections of 10-16.<br>
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