9:
6
Hong Kong Supply.
Kowloon Supply.
Colony's Supply.
Hong Kong Filtering.
Kowloon Filtering.
Colony's Filtering.
Hong Kong.
COMPARISON OF EXISTING CAPACITIES & ESTIMATED REQUIREMENTS.
It will be seen on comparing figures that in 1928 Hong Kong's estimated production falls short of its estimated requirements by 2.75 mill. gallons per day, and that by 1932 without further works this shortage will have increased to 4.35 mill. gallons per day: figures which speak for themselves.
In Kowloon the estimated production this year exceeds the estimated con- sumption by 1.2 mill. gallons, but this surplus will have practically disappeared by 1932.
Taking the Colony as a whole the total shortage during the current year is estimated at 1.55 mill. gallons per day, a figure which will increase to 4.25 mill. gallons per day in 1932.
The approximate working capacity of the Hong Kong Filter Beds is 9.3 mill. gallons per day, which is 0.7 mill. gallons less than the current year's estimated average daily consumption. An annual daily average consumption of 10 mill. gallons means a daily average during the four hottest months of the year of at least 11 mill. gallons, so that the deficiency in filtering capacity on the Island is really 1.7 mill. gallons per day, and will rise to about 3.7 mill. gallons per day in
1932.
The approximate working capacity of the Kowloon Filter Beds is 7.9 mill. gallons per day (on completion of Shing Mun Filters) while the highest average daily consumption during 1927 over a period of one week was 4.16 mill. gallons, or, say, 4.5 mill. gallons per day in 1928.
There is therefore a surplus filtering capacity of 3.40 mill. gallons per day. but this surplus figure will dwindle to about 2.3 mill. gallons in 1932.
Taking the Colony as a whole there is a surplus filtering capacity of 1.70 mill. gallons per day, but by 1932 this surplus will have disappeared and there will be a deficiency of filtering capacity of 1.00 mill. gallons per day.
POSSIBLE WATERWORKS EXTENSIONS.
The following is a list of possible reservoirs and catchwaters on the Island, and below are explanatory notes :-
J
RESERVOIRS.
capacity 70 mill. gallons.
40
J}
}}
7)
700
J
11
78
>
71
2,500
J7
178
72
+
92
"
(a) Tytam Valley
(b)
(c) Tytam Bay
(e) Little Hong Kong Basin
(f) Taikoo Areas (Private)
(g) Aberdeen Valley (Private)..
(d) Pokfulam Valley
CATCHWATERS.
area 380 acres.
379
"
33
::}
620
99
240
JJ
21
(a) Mt. Parker
(b) Mt. Pottinger (Three)
(c) Tytam Tuk East
(d) Dragons Back (West)
(f) D'Aguilar
(East)
(e)
+
525
RESERVOIRS.
Sites (a) & (&).
Reservoir Sites (a) and (b), estimated capacities 70 and 40 million gallons Reservoir respectively, are situated in the upper Tytam Valley within the catchment area of the present Tytam (Upper) Reservoir.
These dams being at a level of 750 above O. D. approximately would be very difficult and costly to develop, would foul Tytam, The Byewash and Tytam Tuk Reservoirs during construction, while Tytam being already under-catchmented, they would not be economical from a water point of view.
Reservoir Site (c) of 700 million gallons estimated capacity is situated in Tytam Harbour below the existing Tytam Tuk Dam and is easily recognizable by the caissons protruding above the sand, like round bridge piers.
It was
This site was investigated about 1904, but a rock foundation for the dam was not found until a depth of 65 feet below 0. D. had been reached. again later considered by the late Mr. Jaffé, who ultimately abandoned it for the site of the present Tytam Tuk Dam which has now cut off a large portion of the original basin of the reservoir. As the site is below sea level, most difficult and costly coffer dams above and below the site would be necessary during construc- tion. The cost of the Dam would be in my opinion out of all proportion to the supply gained, particularly when it is remembered that all the water from this Reservoir would require to be pumped nearly 400 feet.
Reservoir Site (c).
Site (d).
Reservoir Site (d) is situated directly below the existing Pokfulam Re- Reservoir servoir, the dam site being at the road bridge over the stream taking the over- flow from the Pokfulam Valley and outfalling at Waterfall Bay.
The reservoir is small, having an estimated capacity of 78 million gallons while its construction would mean the resumption of Pokfulam Village. The. Dairy Farm and other buildings and the realignment and reconstruction of about half a mile of the main Pokfulam Island Road. These resumptions which would greatly increase the cost of the reservoir are considered undesirable for other
reasons.
Reservoir Site (e) is the basin on the South side of the Island containing the village of Little Hong Kong and bounded on the North by Bennets Hill and Mt. Cameron and on the South by Brick Hill, two dams being necessary, one across Stanton Creek near Aberdeen and the other at the Brickworks close to Deep Water Bay.
This reservoir which is large has very little catchment area for its size, but the overflows from the Aberdeen and Wongneichong Reservoirs could be diverted into it, considerably increasing its productive capacity.
This is the only site left on the Island for a reservoir of any considerable size, but in the past it has been considered inadvisable in the public interests to alienate this valuable flat piece of country from the use of the public. For this reason the site has never been investigated, but in view of the great lengths of the Dams, the considerable resumptions and the heavy contingent works neces- sary, the reservoir would be costly while all the water would require to be pumped, adding further heavy recurrent charges.
PRIVATE SUPPLIES.
Reservoir
Site (6).
Taikoo Catchment Area is situated immediately South of the Taikoo Sugar Taikoo. Refinery and Dockyard on the slopes of Mt. Butler and consists of 692 acres, on which stand three Reservoirs of 137 million gallons, 11 million gallons and 30 million gallons capacity respectively. The water rights, which are held by Messrs. Butterfield and Swire, are capable of some further development, but it is con- sidered by the lease-holders that all water procurable is necessary for their busi-
ness.
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