CO129-572-3 Jubilee Reservoir- Shing Mun- defect in Pineapple Pass Dam. For extracted photographs see CN 3-48.... 1-12-1937 - 15-6-1938 — Page 6

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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