Last Updated：2026/01/01
Sentence
Rock
armour
was
first
used
on
the
line
"in
a
very
small
way"
after
floods
in
2005,
and
more
extensively
last
year
when
an
embankment
had
to
be
reinstated.
"The
destructive
problem
with
flooding
is
when
water
washes
over
the
railway
and
runs
down
the
other
side,"
explains
Hinshelwood.
"If
it
keeps
coming,
it
starts
to
accelerate,
to
scour
and
create
turbulence,
picking
up
ever-larger
material
the
faster
it
washes
across.
You
can't
stop
it,
but
rock
armour
slows
it
to
a
point
where
it
doesn't
wash
ballast
or
embankment
material
away."
Quizzes for review
Rock armour was first used on the line in a very small way
after floods in 2005, and more extensively last year when an embankment had to be reinstated. The destructive problem with flooding is when water washes over the railway and runs down the other side,
explains Hinshelwood. If it keeps coming, it starts to accelerate, to scour and create turbulence, picking up ever-larger material the faster it washes across. You can't stop it, but rock armour slows it to a point where it doesn't wash ballast or embankment material away.
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