水布垭导流隧洞具有水头高，流量大，洞线长，地质环境差等特点，因而技术问题较多，难度较大。为此，进行了大量的试验研究。主要试验成果有：泄流能力及影响泄流能力的主要因素，压力特性及改善压力特性措施，出口消能防冲措施的比较等。这些试验成果为工程优化设计提供了科学依据。

The diversion tunnels of the Shuibuya Project feature high head, big discharge, long tunnel line and complicated geologic conditions. For solving their hydraulic problems, a model test with a scale of 1∶80 was conducted. The paper summarizes the main results, including discharge capacity and the main factors affecting it, pressure characteristics and its improvement measures, and the comparison of energy dissipation schemes downstream the outlet. The research results offers basic data for optimal design of the diversion tunnels.