Enclosure 5th November 1894-
the enclosed copy of a copy of a report with plans by the Director of Public Works on the proposed extension of the Tai Tam Water Works and to suggest that Mr. Chadwick be requested to report his approval by telegram as desired.
I have the honour to be, My Lord Marquess, Lordship's Most Obedient Humble Servant,
Your Lordship's obedient Servant,
W. Robinson
C. O. ALC/05
RECEIVED
LORIC DEC 94
PUBLIC WORKS OFFICE,
Hong-Kong, 5th November, 1894.
264
I have the honour to report that I have considered the proposal to raise the Tai Tam dam, and submit two sections: A and B. The level of the present overflow is 496.30 and that of the dam 493.30 leaving only a margin of 2 feet. The highest flood recorded was on the 29th and 30th May 1889 when the water in the reservoir rose to a level 150.55 above Ordnance Datum, and had it not been for the substantial parapet-wall on the dam, serious consequences might have ensued.
As a reason for raising the dam, I consider that the main embankment should be carried up to the level of maximum flood, and that the parapet-wall should only be relied on for the protection of the outer slopes of the dam from waves that may break against it during heavy gusts of wind.
In design A it is proposed to surround the present dam with a cement concrete (8 of stone to one of cement) wall of a uniform thickness of 9'6" faced with ashlar masonry which is the minimum.
The Hon'ble
The Colonial Secretary.