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Design Data

Manning’s n Values: History of Research

ACPA-Website-Icon-DD10-Mannings-N-Values-History-Of-Research-1Design Data 10:  Manning's N Values - History of Research

Selection of the proper value for the coefficient of the roughness of a pipe is essential in evaluating the flow through culverts and sewers. An excessive value is uneconomical and results in oversizing of pipe, while equally, a low value can result in a hydraulically inadequate pipe.