EN733 [=94] (V.2)
Facsimile
Transcription
733
contact with the masonry. The
series of works above alluded to,
consist of flank defences and
spurs made of boulders and
heavy material strongly tied
together by wooden frame work.
Their fronts being covered by
aprons of similar material guarded
by lines of piles driven to a depth
of from 16 to 20 feet. The ingress
front of the superpassage itself
is covered by an apron of frame
box work, with an upper flooring
of rubble masonry, the apron [itself, struck through]
has an inclination of 5 feet
sloping from the level of the floor
of the superpassage channel,
back in the up stream direction.
The width of this apron is 100
feet, it is carried in a circular
sweep so as to cover the flanks,
and the utmost care has been
given, by placing these protective
works at the lowest possible level,
and by guarding them by lines
of piles driven as deeply and as
closely together as [it, struck through] was possible,
to place them out of reach
of the whirlpools and regurgitations
of water which may be antici-
-pated during floods.
At the point where the
water will leave the channel of
the superpassage, the works are
of a less complicated nature.
Here, however, the defences on the
flanks, and the apron attached
to the flooring are built of the
same plan as those on the
upstream face, the object at this
point, however, is to get rid of
the water, after it has passed
through the contracted channel
of
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