Comparison of Manning's Roughness Coefficient Estimation Methods Based on Channel Geometry and Bed-Load Sediment Characteristics in the Way Tapus River

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Comparison of methods to estimate Manning's roughness coefficient reveals channel geometry offers the most accuracy in sediment analysis.

Channel geometry method produced the most reliable Manning's coefficient with an average error of 15.59%.
n values were estimated between 0.096–0.148 using hydraulic parameters and were lower for channel geometry, ranging from 0.069–0.136.
A comprehensive error analysis indicated other methods had significantly higher estimation errors.
This research supports channel geometry as the preferred method for estimating the Manning coefficient in river flow studies.

Kiranaratri et al. (2025) studied this question.

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