Work has been begun simultaneously
at three points: at Greben, where there are reefs to be taken care of;
at the cataract, near Jucz, and at the Iron Gate proper, below Orsova.
At Greben, where the stream is shallow, but swift, a channel two
hundred feet wide is to be blasted out of the rock, and below it a
stone embankment wall is to be built more than four miles long. From a
reef which projects into the river a piece is to be blasted away,
measuring five hundred feet in length, and about nine feet in depth.
The difficulties of working in this part of the river are very great.
Not only is the current extremely rapid, but in certain places ridges
of rock barely covered at low water alternate with pools a hundred
and forty feet deep, which give rise, in the rapid current, to
frightful whirlpools and eddies. These deep pools are to be filled at
the same time that the reefs are cut away, and it is estimated that
nearly three million cubic feet of loose stonework will be needed for
this purpose alone. In addition to the excavation, artificial banks
and breakwaters, for modifying the course of the stream, are to be
built; so that it is estimated that the masonry to be executed in this
section will amount to about five and one-half million cubic feet.
Pages:
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55