Finally, opening the flood diversion work's gate is through blasting or manpower, and the open order influences the discharge and elevation of water in main river.

最后是行洪区得两个口门一般是通过爆破或人工扒口打开，其开启顺序对干流河道水位、流量情况也有一定影响。

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For the arch dam which reservoir has no suitable breach to build lasher and has mass flood discharge, opening large orifice for flood discharge has great advantage.

对于库区无适宜垭口可兴建泄洪道，而泄洪量又较大的拱坝工程，在坝身中开设大孔口泄洪具有显著的优越性。

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It is demonstrated from the hydraulic modeling that the structure has an obvious effect on the improvement of flow pattern near the river opening for flood discharge.

水工模型试验表明，这种构筑物对于改善河道行洪口门的水流流态具有明显的效果。

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