82
New Resources.
31. From an economic point of view both the Island and Kowloon resources have now been fully developed. Any increase in requirements must therefore be provided by further supplies from Shing Mun or from other sources in the New Territories.
32. The Jubilee Reservoir now has insufficient direct catchment areas to ensure its filling in years of low rainfall, and, as the necessary provision has been made in the Shing Mun Conduits and Tunnels for dealing with larger supplies, the cheapest method of augmenting the present resources immediately would be to construct catch- waters draining the southern slopes of Tai-Mo-Shan. These are coloured red on the plan and would discharge into the Jubilee Reservoir at Pineapple Pass.
33. Messrs. Sir A. Binnie, Son & Deacon have estimated the resources of this area at 4.25 M.G./D. and this value has been adopted. This amount added to the present resources of 23.25 M.G./D. making a total of 27.5 M.G./D., would be approximately sufficient to satisfy the estimated requirements for 1941 but without the 15% margin.
Proposed Extensions.
34. It is therefore recommended that the above catchwaters be provided at the earliest possible date and that the construction programme be arranged for the com- pletion thereof in three years. A review of the water situation could then be made and if further resources are necessary, proposals for the provision thereof would be recommended.
"LINES OF COMMUNICATION”
Explanation.
35. The term "Lines of Communication", as the words imply, is used to describe the channels by means of which bulk supplies of raw water are transferred from the storage reservoirs at the sources of supply to the Filtration plants and Service Reservoirs. They comprise tunnels, conduits and pipe lines. After filtration water is stored in service reservoirs adjacent to the filters prior to being drawn off into the distribution system for supply to the consumers.
Island.
36. Raw water from the Eastern Source is conveyed to the City filters by means of the Tytam Tunnel and Bowen Road Conduit the latter terminating at Albany Filters. From this point a limited amount of water, which is necessary in the dry season to augment supplies from the Western source, can be conveyed to the Western District (Elliot Filters) by means of a pipe line, part of which is of 12" and part of 18" diameter.
37. Raw water from the Aberdeen Valley (Western Source) is brought to the West end of the City (Elliot Filters) by means of a pipe line.
38. Raw water from the Pokfulam Valley (Western Source) is conveyed by a conduit to the West end of the City also and mainly supplies West Point Filters. The resources of this supply for the City are very small as the conduit is tapped en route to provide unfiltered water for the Pokfulam residential area. The con- sumption in this area has grown to such an extent that in the winter the Pokfulam Reservoir has virtually to be reserved for it.
39. Owing to the limited supplies available from other sources it has been necessary during periods of high consumption in summer, to utilize flood water from the Pokfulam source, and to enable this to be done the Pokfulam Conduit has been connected to Elliot Filters and also to the main between the latter and Albany