Hydraulic Efficiency of Grate and Curb Inlets - Urban Drainage and ...

S c , Sc, cross slope cross (or lateral) slope
S e
S f
S L
S o
equivalent street cross slope (ft/ft)
friction slope
longitudinal (street) slope (ft/ft)
bottom slope of the channel
S w gutter cross slope (ft/ft) (UDFCD, 2008)
S x street cross slope (ft/ft) (UDFCD, 2008)
S x
t
T
T
side slope
dividing the standard error of the parameter estimate by the estimate itself
in SAS
top width of gutter flow
top width for a general cross section
T top width of flow (spread) (ft) (UDFCD, 2008)
T
top width of flow spread from the curb face (ft)
T s spread of flow in street (ft) (UDFCD, 2008)
T w
V
V
V
V o
V 0
V r
velocity
W
top width parameter
velocity (of cross-sectional averaged flow, flow in the gutter, and
approaching flow) (ft/s)
velocity of flow at the inlet (ft/s), determined from Q/A
cross-sectional average flow velocity (ft/s)
splash-over velocity (ft/s)
velocity of approaching flow
velocity scaling ratio
flow velocity parameter
width (of the gutter, gutter section, and depressed gutter section) (ft)
W width of gutter pan (ft) (UDFCD, 2008)
W p
y
y 0
wetted perimeter
depth (of flow in the gutter and flow in the depressed gutter section) (ft)
depth of flow over the first opening
α,β,γ,η constants (UDFCD, 2008)
θ
angle formed by the curb and gutter
xi