Hydraulic Design of Highway Culverts - DOT On-Line Publications

GLOSSARY (Cont.)
TP Top width of flow prism, m (ft)
TAPER Cotangent of angle of sidewalls in tapered inlet with respect to an extension
of the culvert sidewalls, m/m, (ft/ft)
TW Tailwater depth measured from culvert outlet invert, m (ft)
V Mean velocity of flow, m/s, (ft/s)
Vd Channel velocity downstream of culvert, ft/s m/s, (ft/s)
V9 Velocity of flow between bars in a grate, m/s, (ft/s)
Vo Velocity at outlet of culvert, m/s, (ft/s)
VU Approach velocity upstream of culvert, m/s, (ft/s)
w Maximum cross-sectional width of the bars facing the flow, m (ft)
W Length of weir crest for slope tapered inlet with mitered face, m (ft)
WP Length of weir crest of fall, excluding sides of depression, m (ft)
WW Wingwall of culvert entrance
x Minimum clear spacing between bars, m (ft)
X1,X2,X3 Lengths of overflow sections along embankment, m (ft)
y Depth of flow, m (ft)
y' Change in hydraulic grade line through a junction, m (ft)
Y Additive term in submerged inlet control equation
Yh Hydraulic depth = AP/TP m (ft)
Z The difference in elevation between the crest and face section of a slope
tapered inlet with a mitered face, m (ft)
Θg Angle of bar grate with respect to the horizontal, degrees
Θs Flare angles of side walls of tapered inlet with respect to extension of
culvert side wall, degrees
Θt Angle of departure of the top slab from a plane parallel to the bottom slab,
degrees
ΘW Flare angle of wingwalls with respect to extension of culvert side wall,
degrees
Angle between outfall and lateral at a junction, degrees
Θj
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