Reports on Proposed Bunbury Harbour Works
Prose Books
by C. Y. O'Connor.
DESCRIPTION

From the West Australian Newspaper, Friday 24 April 1896 (Page 5): In the evening our representative interviewed the Engineer-in-Chief, with reference to the alternative schemes for harbour works at Bunbury. Mr. C. Y. O'Connor said since he was last in Bunbury the surveys which were then in progress for the purpose of producing a chart upon which the various schemes for harbour works in Bunbury could be sketched out have been completed and printed. The plan shows the two alternative schemes which to far have been projected. One of them is that which was referred to by me in my interview with the Bunbury Municipal Council so to short time age, namely, the construction of an, entrance channel into the Leschenault estuary, near its confluence with the Preston River, the other being the construction of a sheltering breakwater from Point Casuarina towards the north and east, in a curved form, so as to afford complete shelter to the jetty and anchorage from all winds to west of north. The first of these schemes has been laid down on the charts in the shape of a channel, having a width of 300ft. throughout, leading from a four fathom lice on the coast through the sandhills, thence into the estuary and thence continuing in a south westerly and westerly direction from the estuary up to a point adjacent to the railway station. In connection with the scheme there will be a contrast our wharf along the south side of the said channel from the railway station to about the centre of Pig Island, a distance of 1500ft. But if necessary this wharf could, of course, be lengthened by extending it further to the eastward along the channel in the estuary, in order to protect the entrance at the channel, which would be dredged from the four fathom line up to high-water mark. There is also provision for two breakwaters playing out towards the north and south respectively from the entrance, with a width of 600 feet or go, the length of said breakwaters being each about 2500 feet. It is not possible at the present time to form any, even an approximate, estimate of the best of constructing these, for two reasons. First, because the place from which the stone could be most cheaply obtained, and the character of the stone which it would be found best to use for the purpose, and the cost of quarrying and conveying the same, etc., have not at present been determined, and can't do fact be determined for some considerable time, not until surveys for the exploration and boring have been made. As regards the dredging of the channel, further borings will have to be made before the nature of the material to be dealt with and the best mode of dealing with it can be known. The quantities, however, of the work to be done are approximately as follows via the north and south breakwater about 480,000 cubic yards of rubble stone, and in the excavations of the channel about 4,000,000 cubic yards of excavation is what is believed to be sand. As regards the second alternative proposal, viz., sheltering breakwater from Point Casuarina, its length as shown of the plan is about 6 600ft. But in this case also it is not possible to afford any Amato of what the, mole, as indicated on the chart, is stated to be approximately 1,000,000 cubic yards fif in Mr. The map, which has been prepared is partly a compilation from various sources, and partly the result of recent surveys made by Mr. Leonard Dartnall. The compilations are partly from original large scale plans of the Admiralty charts, which were obtained from the Survey Office, and partly from the Survey Office plans of the town of Bunbury, and Mr. Dartnall is to be commended for the energy and ability which he has displayed in producing such a large amount of information in a very creditable form within the short time which he has had at his disposal. This morning I was taken to a place from which stone in limited quantities can be obtained, but I should de-me to secure a much better stone and in a more promising place than this if possible before adopting any. I went to Panch bowls Estate, but the quantity of stone likely to be got there is quite insufficient for the purpose, and moreover the face of the quarry was so small that it would be very expensive to quarry it. In order to quarry economically we must find a place where we can get a quarry with a face from 40ft. to 80ft. in height, so that the blast can bring down a very large quantity of stone at one time. This is one of the chief factors in economic quarrying and compared with that a few miles in distance is work will probably cost, in the absence of sufficient data to determine the character and position of the stone which would be need for constructing it. The total quantity of cubic yards, however, in the of comparatively little importance. The cost of carrying the stone of rail would not exceed, probably, a half-penny per ton per mile, so that 20 miles would not amount to more than 10d. per ton, whereas the difference between quarrying under favourable conditions and under unfavourable ones may amount to 2s. or 3?. a ton, if not more.

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