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the construction of a seawall consisting of a rubble mound brought up to about low water level and finished above that level with a vertical wall (see details on plan "B") having wharves or piere projected out at right angles therefrom at suitable interval for the purpose of berthing vessels which necessarily could not lie alongside a wall of this type.
The depth of water along the proposed ultim- ate line of seawall is, however, much greater than I anticipated, and piers projected therefrom would be athwart
the tide, which, as Mr. Duncan points out, might render their full use impracticable.
Taking these facts into consideration and quite apart from the heavy cost which would be entailed in the construction of piers under such circumstances, it would appear that the ordinary type of sea-wall and rubble mound hitherto adopted is not suitable in this case, unless concrete wharfage carried out to deep water as shown in sketch plan "C" is made to form a homogeneous part of it.
4. This course is being adopted by the Engineer
carrying out the reclamation work at Marine Lots 430 and
431. The type of wharfage being adopted by them is however
only to accommodate amall craft and is in consequence of
light construction, they are of opinion that it will effect
-
a saving in cost compared with that of a vertical seawall.
The type of wharfage shown in sketch plan "C" which is considered suitable for deep "draughted" ships is of a much heavier type of construction and its cost
including that of the mound would probably be greater than that of a vertical wall that is, if the wharfage is
carried continuously throughout its entire length.
The reclamation now being dealt with by Government at the
Eastern end (Quarry Bay) is also being carried out with
the ordinary type of rubble mound and seawall, but in this
case no pier or whart is being constructed as the leggee
does
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