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飞来峡水利枢纽坝址为深覆盖砂质河床，洪水流量大，要求施工期保持通航，施工导流选用河床分期导流方案。在围堰防冲设计上，采用顺坝、锁坝、丁坝以及复式河床断面等措施，调整水流流态、降低流速，同时在围堰外坡脚抛填防冲堆石体、设置抛石防护带，在纵向围堰上、下裹头采用混凝土柔性排进行防护，模型试验和施工现场观测表明防冲效果良好。围堰深基础防渗设计采用高压喷射灌浆成培技术，实施结果表明基本上是成功的。为保证施工期通航，采用从建成泄水闸闸孔在接过船方案，通过对泄水闸闸孔尺寸、水流流速、流态、上下航道衔接等问题进行探讨和试验论证，设计选取12、13、14、15号泄水闸孔为通航孔，实际运用近7个月时间，船只航行正常。
Feilaixia dam site for the deep sandy sandy riverbed, flood flow, requiring the construction period to maintain navigation, construction diversion river bed staging options. In the design of cofferdam anti-punching, adopting the measures such as Shunba, Damshading, Dingba and duplex river bed sections, the flow pattern of water flow is adjusted and the flow velocity is reduced. At the same time, the rockfill body is thrown on the outer slope of cofferdam to set the stone protection Belt, in the longitudinal cofferdam, the next wrapped concrete flexible row protection, model tests and construction site observations showed that the anti-impact effect is good. Cofferdam deep foundation seepage control design using high-pressure jet grouting technology, the results show that the success is basically. In order to ensure the navigation during the construction period, this project adopted the scheme of taking over the sluice gates from the built-in sluice gate, discussed and verified the hole size, flow velocity, flow pattern of the sluice gates, 14,15 spillway hole for the navigation hole, the actual use of nearly 7 months time, the normal navigation of the ship.