Appendix B

^{Appendix B.5

^{^{^{MANNING “n” VALUES}}}

^{SURFACE
n}

^{Uncoated
cast-iron pipe}

^{^0.013}

^{Coated
cast-iron pipe}

^{^0.012}

^{Commercial wrought-iron pipe, black}

^{^0.013}

^{Commercial wrought-iron pipe, galvanized}

^{^0.014}

^{Smooth
brass and glass pipe}

^{^0.010}

^{Smooth
lockbar and welded “OD” pipe}

^{^0.011}

^{Riveted
and spiral steel pipe}

^{^0.015}

^{Vitrified
sewer pipe}
^{^0.013}

^{Common
clay drainage tile}
^{^0.012}

^{Glazed
brickwork}
^{^0.013}

^{Brick in
center mortar; brick sewers}
^{^0.015}

^{Neat
cement surfaces}
^{^0.011}

^{Cement
mortar surfaces}
^{^0.013}

^{Concrete
pipe}
^{^0.012}

^{Concrete
pipe}
^{^0.012}

^{Wood
stove pipe}
^{^0.011}

^{Plank
flumes: Planed}
^{^0.012}

^{Plank
flumes: Unplaned}
^{^0.013}

^{Plank
flumes: With battens}
^{^0.015}

^{Concrete-lined channels}
^{^0.014}

^{Cement-rubble surface}
^{^0.020}

^{Dry-rubble
surface}
^{^0.030}

^{Dressed-ashlar
surface}
^{^0.014}

^{Semi-circular metal flumes, smooth}
^{^0.012}

^{Semi-circular metal flumes, corrugated}
^{^0.025}

^{Canals and
ditches: Earth, straight and uniform}
^{^0.025}

^{Canals and
ditches: Rock cuts, smooth and uniform}
^{^0.033}

^{Canals and
ditches: Rock cuts, jagged and irregular}
^{^0.040}

^{Canals
and ditches: Winding sluggish canals}
^{^0.025}

^{Canals
and ditches: Dredged earth channels}
^{^0.0275}

^{Canals and
ditches: Canals with rough stony beds, weeds on earth banks}
^{^0.035}

^{Canals and
ditches: Earth bottom, rubble sides}
^{^0.030}

^{Natural
stream channels: (1) Clean, straight bank, full stage, no rifts or deep
pools}
^{^0.029}

^{Natural
stream channels: (2) Same as (1), but some weeds and stones}
^{^0.035}

^{Natural
stream channels: (3) Winding, some pools and shoals, clean}

^{^0.039}

^{Natural stream channels:}^{(4) Same as
(3), lower stages, more ineffective slope and sections}
^{^0.047}

^{Natural
stream channels: (5) Same as (3), some weeds and stones}

^{^0.042}

^{Natural
stream channels: (6) Same as (4), stony sections}
^{^0.052}

^{^{Natural stream channels:} (7)
Sluggish river reaches, rather weedy\or with very deep pools}
^{^0.065}

^{^{Natural stream channels: (}8)
Very weedy reaches}
^{^0.112}

For additional “n” values, refer to Table}

^{^{^{MANNING “n” VALUES}}}
^{SURFACE n}
^{Uncoated cast-iron pipe}	^{^0.013}
^{Coated cast-iron pipe}	^{^0.012}
^{Commercial wrought-iron pipe, black}	^{^0.013}
^{Commercial wrought-iron pipe, galvanized}	^{^0.014}
^{Smooth brass and glass pipe}	^{^0.010}
^{Smooth lockbar and welded “OD” pipe}	^{^0.011}
^{Riveted and spiral steel pipe}	^{^0.015}
^{Vitrified sewer pipe}	^{^0.013}
^{Common clay drainage tile}	^{^0.012}
^{Glazed brickwork}	^{^0.013}
^{Brick in center mortar; brick sewers}	^{^0.015}
^{Neat cement surfaces}	^{^0.011}
^{Cement mortar surfaces}	^{^0.013}
^{Concrete pipe}	^{^0.012}
^{Concrete pipe}	^{^0.012}
^{Wood stove pipe}	^{^0.011}
^{Plank flumes: Planed}	^{^0.012}
^{Plank flumes: Unplaned}	^{^0.013}
^{Plank flumes: With battens}	^{^0.015}
^{Concrete-lined channels}	^{^0.014}
^{Cement-rubble surface}	^{^0.020}
^{Dry-rubble surface}	^{^0.030}
^{Dressed-ashlar surface}	^{^0.014}
^{Semi-circular metal flumes, smooth}	^{^0.012}
^{Semi-circular metal flumes, corrugated}	^{^0.025}
^{Canals and ditches: Earth, straight and uniform}	^{^0.025}
^{Canals and ditches: Rock cuts, smooth and uniform}	^{^0.033}
^{Canals and ditches: Rock cuts, jagged and irregular}	^{^0.040}
^{Canals and ditches: Winding sluggish canals}	^{^0.025}
^{Canals and ditches: Dredged earth channels}	^{^0.0275}
^{Canals and ditches: Canals with rough stony beds, weeds on earth banks}	^{^0.035}
^{Canals and ditches: Earth bottom, rubble sides}	^{^0.030}
^{Natural stream channels: (1) Clean, straight bank, full stage, no rifts or deep pools}	^{^0.029}
^{Natural stream channels: (2) Same as (1), but some weeds and stones}	^{^0.035}
^{Natural stream channels: (3) Winding, some pools and shoals, clean}	^{^0.039}
^{Natural stream channels:}^{(4) Same as (3), lower stages, more ineffective slope and sections}	^{^0.047}
^{Natural stream channels: (5) Same as (3), some weeds and stones}	^{^0.042}
^{Natural stream channels: (6) Same as (4), stony sections}	^{^0.052}
^{^{Natural stream channels:} (7) Sluggish river reaches, rather weedy\or with very deep pools}	^{^0.065}
^{^{Natural stream channels: (}8) Very weedy reaches}	^{^0.112}