梯形渠道的水力最优断面因为具有在过水断面面积一定时通过的流量最大的特点，是水利工程中一种常见的渠槽形式，它的断面设计需求解一个很复杂的高次方程。

Trapezoid channel is a common form in hydrological project with characteristic of maximum influx at a certain time, its section designing requires a complex equation of higher degree.

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通过井下水力压裂方式将钻井废弃物回注到地下是目前海上油气开发钻井废弃物处理最优方法，不仅成本低，而且可以实现废弃物零排放。

The drilling waste being injected to underground by hydraulic fracturing is the optimal treatment method of drilling waste on offshore oilfield for its low costs and zero discharge of waste.

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以矩形槽为例，分析求解渡槽最优纵坡，提出了渡槽最优水力要素的计算步骤和计算方法，所推导公式的方法同样适应于淤地坝无压输水涵洞、暗渠等类似工程。

In this paper, taking the rectangular aqueduct as the example, based on the analysis of the optimal solution aqueduct, the calculation steps and method of the optimal hydraulic elements are proposed.

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