Based on the Manning’s n values of Table 3.4, determine the average relative error that should be expected in a value of n for the following conditions: (a) Unlined open channel (earth, uniform section), (b) roadside channel and swales (depth up to 0.7 ft); (c) natural stream channels, minor stream (fairly regular section); and (d) natural stream channels, floodplains (cultivated areas). Assuming that the velocity, V, and roughness are related by V = 0.2/n, what would be the mean velocity and relative error in the mean velocity for each of the four flow conditions? For Problems 3.32 to 3.34, estimate the value of Manning’s n using the method by Cowan (Table 3.11). Compare the estimate with the value from Table 3.4 using the category that best matches the stated description of the channel reach.
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