87
Estimated requirements,
77. It is the general practice to provide service reservoir accommodation equal to two days average supply and the writer sees no reasons for deviating from this principle in the City.
78. The capacity of the service reservoirs for 1937 for an estimated average consumption of 14.5 M.G./D. should therefore be 29.0 M.G. whilst for 1941 the capacity should be 33.0 M.G. for an estimated average consumption of 16.5 M.G./D.
79. There will thus be deficiencies in 1937 of 2.70 M.G. on the gross capacity and 7.0 M.G. on the working capacity.
80. In 1941, if the present capacities are not augmented in the meantime, these deficiencies will be 6.70 M.G. and 11 M.G. respectively.
Proposed Extensions.
81. It is therefore recommended that a new service reservoir of 5 M.G. capacity be constructed as early as possible and that the provision of at least a further 6 M.G. capacity be made by 1941.
82. The first of these proposed reservoirs should be constructed in the Botanical Gardens in order to make more use of present supplies and to deal with the increasing requirements from the Mainland.
83. An extra 1.88 M.G. storage is proposed at Bowen Road Filters as the present storage of 1.12 M.G. is insufficient for the area supplied from this service
reservoir.
84. Additional storage is proposed at Eastern Filters by the conversion of the existing slow sand filters into a service reservoir but this would be undertaken after construction of the filters recommended in para. 71.
85. The present storage capacity of the "Mid-Level" Zone is inadequate and in order to obviate this, it is proposed to construct at Peak Road a new service reservoir at a level of 750 feet and of a capacity of not less than 600,000 gallons. (see also para. 105).
86. A further service reservoir of 100,000 gallons capacity is recommended in connection with the proposed scheme (para. 107) of supplying the Pokfulam residential area with filtered water.
Mainland.
Existing Capacity.
87. The total capacity of the various service reservoirs on the mainland is 9.22 M.G. details of which are given in Appendix V. The capacity of Shek Li Pui Service Reservoir amounting to 11.410 M.G. has not been included in the above owing to the reservoir being situated at so great a distance from Kowloon. This reservoir has no separate distribution area of its own and consequently does not perform the function of a service reservoir. Its chief duty is to feed the service reservoirs supplied with Shing Mun Water but in case of emergency it can supply water directly to the consumer in certain areas through cross connections to the distribution system. For this reason the usual capacity of two days supply might reasonably be reduced to 11 days, and this should provide sufficient margin to cover "peak load" and the difference between working and maximum capacity of the reservoirs.
Estimated Requirements.
88. The capacity for 1937, for an estimated average consumption of 9.1 M.G./D., should therefore be 13.65 M.G. and for 1941 the capacity should be 17.25- M.G. for an estimated average consumption of 11.5 M.G./D.