181
No. 10
1927
HONG
KONG.
ABERDEEN VALLEY CATCHMENT AREA DEVELOPMENT,
In August 1926 Mr. R. M. Henderson, Engineer-in-charge of Water- works, submitted a complete report with plans and estimates for two alterna- tive schemes for the partial and complete development of the Aberdeen Valley respectively.
After further consideration it was decided that the proposal for this Annexe A. complete development of the catchment area, would prove the more satis- factory scheme and extracts from the report are annexed.
The scheme consists of the development of the whole of the Aberdeen Valley and the catchwatering of the areas to the East as far as Wongneichong Gap and to the West as far as Mt. Kellett Bay.
It will be necessary to construct a reservoir in the Aberdeen Valley immediately above the existing reservoir, and the existing Paper Mills Dam will require reconstruction to meet the new conditions.
Pipe lines will be necessary from both reservoirs to Aberdeen where they will join and a common pipe will run from there to Elliot Filter Beds by way of Island Road, Victoria Road, and Pokfulam Road.
To deal with the increased supply, Elliot Filter Beds will require to be extended and new beds will be constructed at Pokfulam Road near the Uni- versity Recreation Ground, the latter beds discharging into the Kennedy Town tank.
A Pumping Station will be required at Sandy Bay to deal with the lower reservoir water and a portion of the higher reservoir, but the larger portion of the water can be delivered by gravity.
Small alterations will be necessary at Pokfulam Reservoir which will be linked up to the main supply pipe by a subsidiary pipe, allowing a larger draw-off than is at present possible.
The scheme gives a very flexible system which will prove a great relief to the Western districts of the City which at present are the first to be res- tricted and, if need be, water can be passed as far East as Albany by means of the existing Albany-Elliot Unfiltered Water Mains, the flow in the pipe being reversed.
The scheme as originally designed was estimated to give a supply of 2.12 million gallons per day at a cost of $2,605,000 and to take approximately three years to complete but as a result of recent inspection of the area an amended estimate of $2,627,000 (including resumption) is put forward as the cost of this scheme.