CO129-513-6 Hong Kong water supply- schemes for development and improvement 25-1-1929 - 2-8-1929 — Page 70

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There is rock at both the east and the west ends

of Kowloon Pt. The section enclosed shows it at the west end. At the east end there is rock where the railway turns northward. From this point to Kellett Is. would be the shortest route for a tunnel under the harbour. I have not

been on Kellett Id. and do not know whether the rock there

is solid enough for a shaft. If so and there were no objection to running pipes on the surface from there to the land, this would seem to be a suitable location.

Borings will be necessary to determine the depth to bed rock. I would suggest starting with three holes, one in the centre and one on each side, about midway between it and shore. If these did not reveal any difficulty then a further set of holes between these original ones should be drilled. The latter would be for the purpose of eliminating any possibility of there being an unknown channel between the original holes.

If the depth to bed rock in the harbour should by any chance prove too great, a test hole at Lye Mun Pass might

be tried.

If Kellett Is. is suitable for a shaft, I should be inclined to favour the first trial line of holes between

it and the bend in the railway at Kowloon Point, with the line of the enclosed section as second choice.

I would be glad to study the borings, should boring be decided upon.

For this I would need a plan of the holes, a log of the drilling and a sample of each material encount- ered. (The sample should consist of about one pound of the material). As bed rock is approached the material will probably become coarser, and then the weathered product of the granite will be encountered. The latter may be a little difficult to distinguish fran the sediment without close

study.

I have, &c.,

(Sd.) R. V. Brock

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1000

Mr.Gough

500

Sea level

-500

Volcanics

-1000