老挝南果河水电站压力前池溢水道采用阶梯式消能工布置型式，为论证设计的合理性，进行了水工模型试验。试验研究表明，消能工陡槽做成阶梯式后，由于阶梯溢流面水流掺气，改善了泄流流态，消能效果非常显著，从而简化了下游消能防冲设施，节约了投资，且大大降低了空化危险性。 The water overflowing channel of the Nanoguo Hydropower Station in Laos adopted a stepped energy dissipater arrangement. To demonstrate the rationality of the design, hydraulic model tests were carried out. Experimental study shows that after the energy dissipater chute is stepped, the discharge flow is improved due to aeration of the water flow in the stepped overflow surface, and the energy dissipation effect is very significant, thereby simplifying the downstream energy dissipation and erosion prevention facilities and saving investment , And greatly reduce the risk of cavitation.