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This document discusses a research paper on the topic of flow through gated circular culverts. The authors propose a classification of flow types and introduce a power relationship between discharge and head. They argue that a more robust flow equation should consider the dynamic nature of the gate opening. Another study by Zeng et al. provides dimensionless flow rating equations for different flow types. The document provides valuable information for researchers studying flow through culverts, focusing on the computation of flow in gated culverts. The authors analyze experimental data and suggest a simplified flow type categorization that yields accurate flow estimates. They also discuss the challenges of defining flow type separation criteria and emphasize the importance of balancing simplicity and accuracy in hydraulic engineering practice. [Extracted from the article]