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<br /> n = (n + n + n + n + n ) m <br /> o 1 2 3 4 5 <br />in which <br />n = base value for straight uniform channels <br /> 0 <br />n = additive value due to cross-section irregularity <br /> 1 <br />n = additive value due to variations of the channel <br /> 2 <br />n = additive value due to obstructions <br /> 3 <br />n = additive value due to vegetation <br /> 4 <br />m = multiplication factor due to sinuosity <br /> 5 <br />