EN792 [=153] (V.2)
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792
It is desirable that the
masonry descents should be placed
at as great a distance from each
other as possible so as to prevent
the accumulation of velocity
on the heads; and to secure this,
the above rule of placing the
falls equidistantly is probably
the best; in practice, however, the
falls are in all cases connected
with bridges, so that their position
on the escape, depends in a great
measure on the high roads of the
country. In all cases where the
depth of channel is sufficient
I have designed the waterways of
these bridges in one bay of 50 feet
width.
The total cost of the excavation
on the above work was [Cos Rs?] 20802..8..5
at a rate equal to [Cos Rs?] 1..10..5.6 per
1000 cubic feet.
The masonry head consists
of 10 openings of 6 feet in width each,
their height from flooring to the
soffit of the arch being 8 1/2 feet;
the flooring is raised 2 feet above
the canal bed in graduations de-
-pending on the working of the
gates and sleepers. The transverse
width of the flooring is equal
to 64 feet, 40 of which form the
tail which is laid on a slope
(inclining down stream) of 1 foot
from the level of the canal bed.
The flanks of this work are pro-
-tected by masonry revetments
and the usual guards of piling
and rubble work, with which
the floorings are also covered and
protected from the wear and tear
of the current on its approach
and departure, by box work aprons.
In
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