New mains and submains were laid to enlarge or replace old encrusted ones and to meet the demands of new development.
Water Analysis
314. During the year samples of water were taken regularly from service reservoirs and consumers' taps and tested by the Government Pathologist and Chemist. Generally, the standard was satisfactory, but when samples were not to the required standard of purity the cause of pollution was traced and the necessary remedial action taken.
315. A total of 328 samples were taken from service reservoirs, and of these, 316 or 96% were up to the required standard, that is to say, they showed an absence of coliform organism in 100 c.c. The reasons for eight out of the twelve bad samples were traced, and after suitable treatment repeat samples were satisfactory. No specific cause was determined in respect of three out of the four remaining samples, but the chlorine dosage at the reservoirs from which they were taken was temporarily increased as a precaution. The remaining bad sample was taken from a supply main in the Peak area and contamination was eventually traced to a defective inside service at an adjacent property.
316. A total of 1,118 samples were taken from consumers' taps and 1,050 representing 94% found to be satisfactory. The contamination which had been prevalent in the Kowloon Tong area at the end of last year persisted and was responsible for nineteen of the bad samples. Most of the other bad samples were due to defects in inside services, and in all cases after repairs and sterilization repeat samples were satisfactory.
317. Samples were formerly taken by the Medical Department, but during the year the Waterworks Office took over this work and all samples are now taken by full-time water samplers forming part of the Waterworks Establishment.
Pumping
318. The following table shows the quantity of raw and filtered water pumped as compared with the previous year:
1957/58 1956/57 Increase Raw Water Million Gallons 8,567 3,673 4,894 Filtered Water Million Gallons 7,841 2,993 4,848 Total Million Gallons 16,408 6,666 9,742319. The total quantity pumped was approximately 145% more than during the previous year. The marked increase in the quantity
51
new mains and submains were laid to enlarge or replace old encrusted ones and to meet the demands of new development.
Water Analysis
314. During the year samples of water were taken regularly from service reservoirs and consumers' taps and tested by the Government Pathologist and Chemist. Generally, the standard was satisfactory, but when samples were not to the required standard of purity the cause of pollution was traced and the necessary remedial action taken.
315. A total of 328 samples were taken from service reservoirs, and of these, 316 or 96% were up to the required standard, that is to say, they showed an absence of coliform organism in 100 c.c. The reasons for eight out of the twelve bad samples were traced, and after suitable treatment repeat samples were satisfactory. No specific cause was determined in respect of three out of the four remaining samples, but the chlorine dosage at the reservoirs from which they were taken was temporarily increased as a precaution. The remaining bad sample was taken from a supply main in the Peak area and contamination was eventually traced to a defective inside service at an adjacent property.
316. A total of 1,118 samples were taken from consumers' taps and 1,050 representing 94% found to be satisfactory. The contamination which had been prevalent in the Kowloon Tong area at the end of last year persisted and was responsible for nineteen of the bad samples. Most of the other bad samples were due to defects in inside services, and in all cases after repairs and sterilization repeat samples were satisfactory.
317. Samples were formerly taken by the Medical Department, but during the year the Waterworks Office took over this work and all samples are now taken by full-time water samplers forming part of the Waterworks Establishment.
Pumping
318. The following table shows the quantity of raw and filtered water pumped as compared with the previous year:
1957/58 1956/57
Increase
Raw Water Million Gallons
Filtered Water Million Gallons
Total Million Gallons
8,567
7,841
16,408
3,673
2,993
6,666
4,894
4,848
9,742
319. The total quantity pumped was approximately 145% more than during the previous year. The marked increase in the quantity
51
No comments yet.
Private notes are available after approval.