CO129-477 - Public Offices - 1922 — Page 77

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76

We would point

out ho vever, that reinforced concrete wharfing such as that shown upon the drawing could not well be added after the rubble mound has been deposited, on account of the difficulty in driving the piles. In this event the wharf should be placed further seaward so that the wharf piles might be kept qlear of the rubble slope. The gangways could no doubt be satisfactorily carried by columns planted in the rubble.

17. Owing to the exposed position of the site, there would also be a possible risk during a typhoon or strong gales, of damage to the decking of the proposed wharves due to waves striking its underside near the time of high water, and precautions should be taken accordingly. On the other

hand it would be quite possible to construct a blockwork wall at probably no greater coat than the reinforced concrete structure, which would suffer no damage in any sea, but the vertical face of such a wall would increase sea disturbance in its vicinity.

18. We may say that, as a general rule in dealing with harbours and harbour entrances, it is very desirable to retain certain portions of the foreshore in a more or less natural condition so that waves may break thereon and expend their force rather than be propagated up the harbour. In many harbours it ha actually been found necessary to construct artificial spending beaches and wave traps in order to effect this purpose.

We are, etc..

(sd.) COODE, FITZMAURICE, WILSON & MITCHELL.

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