CO129-513-6 Hong Kong water supply- schemes for development and improvement 25-1-1929 - 2-8-1929 — Page 86

4.

80

Conclusions.

line passes through a zone of mud and silt about four hundred feet long varying in thickness from a few inches to two feet. Fran the four hundred feet mark the harbour bottom is hard, but varies in composition from fine and coarse sand, to sand and shells, as far as the four

thousand five hundred feet mark. From the four thousand

five hundred feet mark to the five thousand two hundred feet mark the bottom is still hard, but with patches of loose coarse sand, while from the five thousand two

hundred feet mark to close to the Kowloon Sea Wall there

is mud varying in depth from two feet to a few inches.

A large number of the concrete mooring blocks

in the harbour varying in weight from ninety tons to two or three tons have also been examined for subsidence.

From all the information collected it would

appear that, with the exception of the two mud zones,

one on each side of the harbour, the harbour bottom on the line selected is capable of supporting a fairly heavy pipe without more than slight initial subsidence. The

hand prickings and examination of mooring blocks also

lead one to the conclusion that the crust of the harbour

bottom on the proposed line is fairly thick and that

after initial subsidence has taken place there should

be little further movement.

Proposed Scheme.

I am of opinion therefore that the following

general scheme is feasible, and is sound both from an

Engineering and Financial stand point.

I would propose that either pairs of concrete blocks or composite double blocks of special design be

cast and laid on the harbour bottom at distances of about

three hundred feet along the proposed line.