§ 5.3.4. Roughness Coefficients

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The coefficients of roughness listed in Table 5-2 are for use in Manning's Equation.

Table 5-2 Roughness Coefficients "n" For Storm Drains
Materials of Construction	Minimum Design Coefficient
Concrete	0.012
Plastic Pipe (smooth wall)	0.010
Plastic Pipe (smooth wall, perforated)	0.020

                    
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