200. A full supply was thus maintained for 2 days only compared with 5 days in 1949/50 and 173 days in 1948/49 and the average hours per day were only 13.5 as compared with 15.5 in 1949/50.
201. This year for the first time it was considered advisable to impose an afternoon shut-down as early as the 20th October and to limit the hours of supply to as little as 10.4 hours per day for 93 days.
202. Unfortunately at the same time as it was necessary to restrict the hours of supply, water was lost by the overflowing of some or all of the reservoirs on 100 days between 14th June and 17th October. Greater advantage could not be taken of this available water on account of the lack of additional filtration.
203. Filtration. All supplies from the main waterworks, i.e. excluding only the New Territories supplies, are now both filtered and chlorinated. During the year automatic chloronomes were installed at two small outlying filters on Hong Kong Island at Chai Wan and Wongneichong. Two more chloronomes were also being installed in New Territories supplies at Taipo and Tsun Wan at the end of the year.
204. Water Analyses. The purity of the supply was maintained at a high standard. Only 1% of the samples taken for bacteriological analysis at service reservoirs was below the standard of B. Coli absent in 100 c.c. and in no case was B. Coli present in 50 c.c. Of samples taken at taps under 6% showed B. Coli present in 100 c.c. or less, compared with 11% last year. Most of these cases were ascribed, on investigation, to faulty inside services. As regards chemical analysis the reports were 100% satisfactory. The sampling and testing for bacteriological and chemical analyses were carried out by the Government Pathologist and Government Chemist respectively.
205. Pumping. The distribution of the 12,226 million gallons necessitated the pumping of 2,766 million gallons before filtration and 2,667 million gallons after filtration. This latter figure is more than double that for 1949/50 due almost entirely to the concentration of filtration at the new rapid gravity filters at Eastern and the conversion of the Bowen Road raw water gravity conduit to a filtered water pumping main.
206. Waste Detection. A start was made with one gang on the Island and two on the mainland. Altogether 64 area plans have been prepared and of these 13 have been checked over in detail on site. Of these areas 11 have been checked for waste with a resultant saving of 0.856 million gallons per day. (vide para. 188).
207. House to house inspection continued and 4,565 notices were served on consumers to alter or repair defective services.
34
200. A full supply was thus maintained for 2 days only compared with 5 days in 1949/50 and 173 days in 1948/49 and the average hours per day were only 13.5 as compared with 15.5 in 1949/50.
201. This year for the first time it was considered advisable to impose an afternoon shut-down as early as the 20th October and to limit the hours of supply to as little as 104 hours per day for 93 days.
202. Unfortunately at the same time as it was necessary to restrict the hours of supply, water was lost by the overflowing of some or all of the reservoirs on 100 days between 14th June and 17th October. Greater advantage could not be taken of this available water on account of the lack of additional filtration.
203. Filtration. All supplies from the main waterworks, i.e. excluding only the New Territories supplies, are now both filtered and chlorinated. During the year automatic chloronomes were installed at two small out- lying filters on Hong Kong Island at Chai Wan and Wongneichong. Two more chloronomes were also being installed in New Territories sup- plies at Taipo and Tsun Wan at the end of the year.
204. Water Analyses. The purity of the supply was maintained at a high standard. Only 1% of the samples taken for bacteriological analysis at service reservoirs was below the standard of B. Coli absent in 100 c.c. and in no case was B. Coli present in 50 c.c. Of samples taken at taps under 6% showed B. Coli present in 100 c.c. or less, compared with 11% last year. Most of these cases were ascribed, on investigation, to faulty inside services. As regards chemical analysis the reports were 100% satisfactory. The sampling and testing for bacteriological and chemical analyses were carried out by the Government Pathologist and Government Chemist respectively.
205. Pumping. The distribution of the 12,226 million gallons necessitated the pumping of 2,766 million gallons before filtration and 2,667 million gallons after filtration. This latter figure is more than double that for 1949/50 due almost entirely to the concentration of filtra- tion at the new rapid gravity filters at Eastern and the conversion of the Bowen Road raw water gravity conduit to a filtered water pumping main.
206. Waste Detection. A start was made with one gang on the Island and two on the mainland. Altogether 64 area plans have been prepared and of these 13 have been checked over in detail on site. Of these areas 11 have been checked for waste with a resultant saving of 0.856 million gallons per day. (vide para. 188).
207. House to house inspection continued and 4,565 notices were served on consumers to alter or repair defective services.
34
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