Z/E.254/128.
COPY OF A LETTER FROM MESSRS BINNIE,DEACON & GOURLEY, TO CROWN AGENTS.
Gentlemen,
Artillery House, Artillery Row,
Victoria Street,
S.W. 1.
13th June 1938.
5
HONG KONG WATER -PINEAPPLE PASS DAM.
In reply to your letter of the 31st May 1938 (Reference
Z/E.254/12A) no further report has been sent to Hong Kong as it
was felt that, until exploratory work had been completed, it
was not possible to come to any definite conclusion with regard
to the remedial work which should be undertaken.
As Mr. G.B.G.Hull, who has charge of this work, has
recently returned from Hong Kong, we have been in communication
with him in order to ascertain the latest developments, and
have to report as follows.
The Pineapple Pass Dam is formed of earth on the water
face, and is provided with a reinforced concrete core wall to
prevent percolation of water. The outer portion is formed of
hand-packed rock fill separated from the core wall by a wedge
of sand, the object of this wedge being to distribute the
pressure transmitted by the core wall, to the rock fill, the
sand settling down should any movement of the rock fill take
place.
After very heavy rainfall the reservoir filled up in
September 1937 and overflowed, when it was noted that the
parapet wall, which surmounts the core wall, had moved to the
extent of about 8 inches at the centre of the bank, and a crack
had developed near the top of the core wall.
This was a small
crack and appeared on the water face of the wall but was not
visible on the downstream face, and no
water passed through it.
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