Copy.
THE UNVERSITY OF BRITISH COLUMBIA
The Colonial Secretary,
Hong Kong.
Sir,
VANCOUVER - CANADA.
Jan. 24, 1929.
63
In reply to your cable concerning Hong Kong Harbour Bed, the bed rock is almost certain to prove to be Hong Kong granite, anywhere from Lye Mun Pass to the East Shore of Belcher's Bay. I enclose a section showing the geology on opposite shores of the harbour and the interpolation between these points of what is to be expected.
The Hong Kong granite is a good rock to work in,
as it breaks well. The railway tunnel, and the water tunnels have afforded data on this point. Under the harbour the rock is not likely to be weathered quite so deeply as on the land, so that an estimate of the weathering based on the depth of weathering found in the railway tunnel should give a sufficient margin of safety.
It is
Above the bed rock is an unknown deposit of silt, the deposit of the Si Kiang. There is nothing on which to base an estimate of the depth to bed rock, and consequently no reason to suspect that this depth is excessive. likely to be greater in the harbour than at Lye Mun Pass where there is a depth of water of 150 feet. This may be the effective limit of the scour of the tide so there may
be a thickness of sediments even here.
I understand the Admiralty have some borings 300
I should ft. in the harbour without reaching bed rock. think these must have been well down into the sediments and
that within another hundred or two feet the bottom would
be reached.
There
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