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II , <br /> 1 <br /> Addlik <br /> 1 <br /> TABLE 3-1 <br /> MANNING COEFFICIENT <br /> CONDUIT MATERIAL MANNING COEFFICIENT <br /> Closed conduits <br /> Asbestos cement pipe .013 <br /> Cast iron pipe .013 <br /> Concrete pipe .013 <br /> Corrugated metal pipe <br /> l .. Plain .024 <br /> Paved invert .020 <br /> Fully paved .013 <br /> Plastic .013 <br /> Vitrified clay .013 <br /> Open channels <br /> Lined channels <br /> Asphalt .015 <br /> Concrete .015 <br /> Rubble or riprap .030 <br /> Vegetal .040 <br /> Excavated or dredged <br /> Earth, straight & uniform .030 <br /> Earth, winding, fairly uniform .040 <br /> Unmaintained . 100 <br /> Natural channels (minor streams) <br /> Fairly regular section .050 <br /> Irregular section with pools . 100 <br /> Adapted from Table XIV, ASCE Manual No . 37 , 1970 <br /> 3-2 <br />