本文件规定了确定阶段的方法？测量站的流量关系。它规定了定义阶段的准确性？流量关系基于足够数量的流量测量，以及相应的水位测量。 本文件考虑了稳定和不稳定通道，并简要描述了对舞台的影响？从岸内到岸外的流量转换关系、控制转换、可变回水和滞后。未详细描述双规站、超声波速度测量站和其他复杂额定曲线的流量测定方法。 注:参考文献中列出的其他国际标准、技术规范和技术报告分别描述了这些类型的额定曲线。

This document specifies methods of determining the stage?discharge relationship for gauging stations. It specifies an accuracy for defining the stage?discharge relationship based on a sufficient number of discharge measurements, complete with corresponding stage measurements. This document considers stable and unstable channels and includes brief descriptions of the effects on the stage?discharge relationship of the transition from inbank to overbank flows, shifting controls, variable backwater and hysteresis. Methods of determining discharge for twin-gauge stations, ultrasonic velocity-measurement stations and other complex rating curves are not described in detail. NOTE These types of rating curves are described separately in other International Standards, Technical Specifications and Technical Reports, which are listed in the Bibliography.