water or wear under pressure
The inner face of the embankment
had better be covered with broken stone to a depth of nine inches rather than with granite pitching
The Midfeather in the valve well
may be of Cast Iron Plates formed
and jointed as per pen sketch.
177
embankments subside in consolidations. broken stone
subsides with the bank. - Wall
- stone or rubble pitching
not subside at once
will
in all
places so that mischief may
be going
and the bank not
shew it until
large
hollow cavities
have been formed by the wash
beneath the stonework-
may
The upper part of the Bank
he pitched
Concrete for
or Covered with
top water level after the embankment has been fully consolidated.
outer side
Detail of Valve Well.
Plan
Details of Cast Iron Midfeather in Valve Well
Cover
ten feet below
Point's A may be made
of best Portland Cement
Such as
d iron borings.
Vertical Section
The
He
iron
plates may be in lengths of three feet.