Hydraulic Design of Highway Culverts - DOT On-Line Publications

GLOSSARY
a Cross-sectional area of orifice, m 2 , (ft 2 )
a’ Constant in rainfall intensity formula
A Full cross-sectional area of culvert barrel or channel, m 2 , (ft 2 )
Ab Area of bend section of slope-tapered inlet, m 2 , (ft 2 )
Af Area of inlet face section of tapered inlet, m 2 , (ft 2 )
AP Area of flow prism, m 2 , (ft 2 )
At Area of tapered inlet throat section, m 2 , (ft 2 )
AW Watershed area, hectares, (acres)
b Face dimension of side bevel, mm, (in)
b’ Constant in rainfall intensity formula
B Span of culvert barrel, m (ft)
Bb Width of bend section of a slope-tapered inlet, m (ft)
Bf Width of face section of a tapered inlet, m (ft)
c Coefficient for submerged inlet control equation
C Runoff coefficient for use in the Rational equation
Cb Discharge coefficient for bend section control
Coefficient of discharge for flow over an embankment
Cd
Cf
Discharge coefficient for face section control
Cr Free flow coefficient of discharge for flow over an embankment
Ct Discharge coefficient for throat section control
CMP Corrugated metal pipe
d Face dimension of top bevel, mm, (in)
dc Critical depth, m (ft)
D Interior height of culvert barrel, m (ft)
De Equivalent diameter, De = 4R, m (ft)
D50 Size of streambed material which exceeds 50% of the material by weight; i.e.,
the median size, mm or m, (in or ft)
E Height of face of tapered inlet, excluding bevel, m (ft)
ELC Elevation of weir crest, m (ft)
ELf Invert elevation at face, m (ft)
ELhc Headwater elevation required for flow to pass crest in crest control, m (ft)
Design headwater elevation, m (ft)
Elhd
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