Consumption
10.09. The total quantity of water consumed in the Urban Areas was 28,898 million gallons and in the New Territories 1,110 million gallons. These are increases on the previous year of 5,327 and 227 million gallons, respectively. The total number of hours of supply was increased by 11% to 4,649.
10.10. The maximum consumption for 24 hours reached an all-time record of 104.18 million gallons on 11th September, and was 10.84 million gallons higher than the previous record.
Distribution
10.11. Improvements to the distribution system, and the longer hours of supply, resulted in a 10% reduction in the number of complaints received during the year.
Water analysis
10.12. The standard of purity aimed at was the absence of Coliform organisms in 100 c.c of treated water. Samples obtained by the waterworks personnel and subsequently tested by the Government Pathologist ensured the maintenance of this standard.
10.13. It was found that only 3.3% of 360 samples taken from service reservoirs were sub-standard and 4.5% of 1,397 from consumers' taps were sub-standard. Where sub-standard samples were recorded from service reservoirs, the chlorine dosage was temporarily increased and subsequent samples proved satisfactory. Of the unsatisfactory tap samples, 7 were attributed to the increase in pressure giving rise to scouring of the supply main, and the remaining 56 were due to defective inside services. After defects had been rectified, subsequent samples proved satisfactory in every case.
In addition, chemical samples were taken and all proved satisfactory.
Pumping
10.14. The following table shows the quantities of raw and filtered water pumped in comparison with that for the previous year:
Raw water Million gallons Filtered water Million gallons Total Million gallons 1961-62 24,235 17,111 ... 1960-61 15,842 11,873 28,984 Increase 7,124 3,969 11,09358
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