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ENTRÄNGE CHANNELS.
241
have beeil impossible to do so with a floating equipment. By this method
of construction, which, with some change in details, was followed throughout
the work, the mattresses were built round the piles, of which there were
between four and eight in each bent, the bents being 15 feet apart. The
only modification was in the varying thickness and width of the mattresses,
and in often substituting J-inch rods for the smaller rods in the corners
or outer sides. Only one or two of the mattresses were injured by the
waves.”
As the south jetty was on the opposite side of the river from the railway
terminus, it was necessary to ferry the waggons of rock and brushwood across.
This was done by a “ model ” barge, with two tracks holding six waggons,
aprons being arranged, adjustable to the tide, at the end of a short pier on
each side of the river. A locomotive for hauling the waggons on the south
side was ferried over, and used between the barges and the work.
The total amount of brushwood used on the jetties until the close of
their construction in 1892, was 390,532 cubic yards; of rock, 373,048
cubic yards; and of pine piling, 253,347 lineal feet.
Dr Corthell furnishes the following details of actual cost :—
s. d.
Uncreosoted piles from the United States,. . 1
Uncreosoted Palma or other approved native piles,
Creosoted piles from the United States, . 2
Mattress work,. ...... 6
Brush work, ....... 4
Large stone (not exceeding 3 cubic yards), . 9
Small stone (not exceeding | cubic yard), . . 7
Concrete blocks, ...... 41
4J per linear foot.
11
så
2 per cubic yard.
^i»
3
^
8
The prices include not only the materials named, but also all iron, straps,
fastenings, ties, scantling, framework, etc., required for their use.
Wave Basin at Westport Harbour, New Zealand.1—“Westport
Harbour is situated at the mouth of the Buller River, on the west coast of
the middle island of New Zealand, and is the most important coal port of that
colony. The river discharges into the Tasman Sea, uearly at right angles to
the coast-line. About 6 miles to the westward of the entrance a natural
shelter from the prevailing south-westerly winds is formed by Cape Foulwind
and the Steeples.”
The external works, designed by Sir John Coode and completed in 1893,
consists of two converging break waters of granite rubble affording an entrance
width of 700 feet in the clear. The breakwaters were splayed inwardly in
plan, in order to provide wave-basins on each side of the river for the dissipa-
tion of heavy seas during gales. It has been found, however, by Mr Rawson,
the engineer to the Westport Harbour Board, that the basin on the west
side was unnecessary, and a rraining-wall, the expense of which might have
1 Rawson on Westport Harbour, Min. Proc. Jnst.. C.E., vol. cxxxvi.
16