General
PLANNING DIVISION
Chief Engineer:
W. D. A. TUCKER, M.A. (Eng.), A.M.I.C.E.
7.32. This Division deals with the preparation of outline proposals for providing water to new development throughout the Colony and also for the planning of major schemes in conjunction with consulting engineers.
Hydrological Section
7.33. The principal function of this Section is to collect and study hydrological data from catchments in the Colony in order to assess the water yield. Observations were made at 112 rain gauging stations, 13 stream gauging stations, 7 reservoir overflow stations and 2 evaporation stations. A new type of stream gauge, particularly suitable for measuring flows with heavy silt burden was being constructed at a stream above Tai Lam Chung reservoir to replace a weir which became continually silted up after each storm. Two new stream gauging stations integrally constructed with the Yuen Long Flood Control Channel were recently completed. These stations will give valuable information on yields from lowland catchments in this area.
7.34. Volume II of the Hydrological Data Book containing rainfall and runoff data collected in the year from various catchments in the Colony was published. A method was established for synthesizing catchment runoffs from rainfall records which have been collected over a period of 82 years. This information was used by the Water Resources Survey for the regulation and operations studies.
Water Resources Survey Section
7.35. The Water Resources Survey is carried out in conjunction with Messrs. Binnie & Partners.
7.36. Work on the regulation and operations studies continued. Computer programmes were written in London. These essentially comprise the forming of a mathematical model of the water supply system, feeding in observed and extended hydrological records in a chronological order with supplies governed by trial rules and analysing the results to obtain the best rule. From results of the regulation study, yields of the existing system and proposed future extensions at various degrees of security
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