10.12. A 4-hour daily supply was maintained until the 2nd May when the supply was reduced to 3 hours daily. The situation deteriorated rapidly and on the 16th May the supply was reduced to 4 hours every second day and on 1st June the supply period was further reduced to 4 hours every fourth day, but low-density residential areas received only 3 hours every fourth day and resettlement estates and public standpipes received a 4-hour supply every other day. These hours of supply continued throughout the year, the only relaxation being on Chinese New Year's Eve when a 10-hour supply from 6 a.m. to 10 a.m. and from 5 p.m. to 11 p.m. was given to all areas.
Distribution
10.13. On the implementation of the 4 hours every 4th day, an immense number of complaints were received because no one had any previous experience of zoning the supply under such severe conditions. Control Centres were set up in the Depots on both sides of the harbour which operated throughout each supply period and enabled instructions to be given without delay to gangs of fitters which attended to troubles with the minimum of delays. As experience was gained and adjustments made to the supply zones, the complaints were gradually reduced to an acceptable minimum. Simultaneously an urgent programme of enlargement of submains was put in hand to cope with the higher rate of draw-off.
Water Analysis
10.14. The standard of purity remained very good, the water being systematically sampled by Waterworks personnel for subsequent bacteriological and chemical analysis. During the year a Chemist was seconded to the Sub-department and he has assumed responsibility for the chemical analysis while the bacteriological analysis is still carried out by the Government Pathologist. The standard of purity aimed at is the absence of coliform organisms in 100 cc. of treated water. Due to the necessity for accepting highly polluted water from the Pearl River, there was some doubt whether the usual standard could be maintained, but bacteriological samples from the filters concerned remained satisfactory.
10.15. Of the 293 samples taken from service reservoirs only 3.8% were below the required standard. Chlorine dosages were temporarily increased and subsequent samples proved satisfactory. Of the 903 samples taken from consumers' taps, 17.1% were below the required standard and in every case the cause was traced to defective inside
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10.12. A 4-hour daily supply was maintained until the 2nd May when the supply was reduced to 3 hours daily. The situation deteriorated rapidly and on the 16th May the supply was reduced to 4 hours every second day and on 1st June the supply period was further reduced to 4 hours every fourth day, but low-density residential areas received only 3 hours every fourth day and resettlement estates and public standpipes received a 4-hour supply every other day. These hours of supply con- tinued throughout the year, the only relaxation being on Chinese New Year's Eve when a 10-hour supply from 6 a.m. to 10 a.m. and from 5 p.m. to 11 p.m. was given to all areas.
Distribution
10.13. On the implementation of the 4 hours every 4th day, an immense number of complaints were received because no one had any previous experience of zoning the supply under such severe conditions. Control Centres were set up in the Depots on both sides of the harbour which operated throughout each supply period and enabled instructions to be given without delay to gangs of fitters which attended to troubles with the minimum of delays. As experience was gained and adjustments made to the supply zones, the complaints were gradually reduced to an acceptable minimum. Simultaneously an urgent programme of enlarge- ment of submains was put in hand to cope with the higher rate of draw-off.
Water Analysis
10.14. The standard of purity remained very good, the water being systematically sampled by Waterworks personnel for subsequent bac- teriological and chemical analysis. During the year a Chemist was seconded to the Sub-department and he has assumed responsibility for the chemical analysis while the bacteriological analysis is still carried out by the Government Pathologist. The standard of purity aimed at is the absence of coliform organisms in 100 cc. of treated water. Due to the necessity for accepting highly polluted water from the Pearl River, there was some doubt whether the usual standard could be maintained, but bacteriological samples from the filters concerned remained satis- factory.
10.15. Of the 293 samples taken from service reservoirs only 3.8% were below the required standard. Chlorine dosages were temporarily increased and subsequent samples proved satisfactory. Of the 903 samples taken from consumers taps, 17.1% were below the required standard and in every case the cause was traced to defective inside
72
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