Scour Depth
In this article i discussed what is scour depth, factors affecting it and how it is calculated
Scour depth is the amount of soil or sediment that has been removed from a specific area around a bridge pier, abutment, or other structure due to the erosive action of flowing water.
It is a measure of the depth of the hole or depression that is formed by the removal of material.
Scour depth is an important factor in the design and analysis of bridge foundations, as it can have a significant impact on the stability and safety of the structure.
Factors influencing scour depth
velocity, direction, and turbulence of the flowing water,
the size and shape of the structure,
the grain size and composition of the soil or sediment, and
the local geology and topography.
It is calculated according to IS-3955
For natural streams in alluvial beds, the normal depth of scour, d (in m) below the HFL(Heighest Flood level) in the stable channel is given by
Lacey’s Formula
𝒅 = 𝟎. 𝟒𝟕𝟑(Q/f)(1/3)
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| Source- www.google.com |
Q = design discharge in cum/sec
f = Lacey’s silt factor =1.76m1/2
m = mean size of particle in mm
For design, the scour depth is more than 1.33d
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