Accurate prediction of the discharge through radial gates is difficult. Existing calibration methods typically provide sufficient accuracy for free flows and submerged flows with jet Froude number at vena contracta larger than 1.7. However, their predictions are poor for submerged flows with jet Froude number less than 1.7. Based on the analysis of experimental data collected by the US Bureau of Reclamation, an empirical indicator was proposed to predict the approximate range of jet Froude number for submerged flows. Accordingly, submerged flows were subdivided into partially submerged flows with fully developed hydraulic jump, and totally submerged flows with undular or no jump. A new discharge calibration method, referred to as the identification method, was developed for the three distinct flow conditions. Verification of the proposed method indicated the discharge prediction accuracies were significantly improved for totally submerged flows.

通过弧形闸门的排放量的准确预测是困难的。现有的校准方法通常为自由流和浸没流提供足够的精度，其中静脉收缩处的射流弗劳德数大于 1.7。然而，他们对射流弗劳德数小于 1.7 的淹没流的预测很差。在分析美国垦务局收集的实验数据的基础上，提出了一个经验指标来预测淹没流的射流弗劳德数的近似范围。相应地，淹没流被细分为具有充分发展的水跃的部分淹没流和具有不规则或不跳跃的完全淹没流。针对三种不同的流量条件开发了一种新的排放校准方法，称为识别方法。