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水利水电工程的规划和设计，需要坝址的水位流量关系曲线。但限于自然条件或因为工程活动，一般只能在坝址的上、下游设立水位站或水文站。当坝址河段纵、横断面变化大且有弯道，使水位出现急剧变化时，用水面比降法插补坝址水位将会出现显著误差。在此，提出一个插补水位的水力学方法，该法只要求河段内的水流为恒定流，且控制断面处为缓变流即可。用水布垭坝址河段的水布垭水位站的水位流量关系的拟定作为算例，说明该法的应用，并对该方法的精度进行评价。
Water conservancy and hydropower project planning and design, the dam needs of the water level flow curve. However, due to natural conditions or because of engineering activities, it is generally only possible to set up water stations or hydrological stations at the upstream and downstream of the dam site. When the vertical and horizontal section of the dam section vary greatly and have corners, so that the water level changes sharply, there will be a significant error when using the water surface drop method to interpolate the dam water level. Here, a hydraulics method for interpolating the water level is proposed. The method only requires that the water flow in the river reach a constant flow, and the control section should be a gentle flow. The relationship between water level and discharge of Shuibuya water level station of Shuibuya dam reach is taken as an example to illustrate the application of the method and to evaluate the accuracy of the method.