308. Of 367 samples taken from service reservoirs and 1,050 samples taken from consumers, only 2% and 5% respectively produced results below the required standard. Where sub-standard samples were recorded from service reservoirs, the chlorine dosage was temporarily increased and subsequent samples proved satisfactory. The unsatisfactory tap samples included five taken from a partially treated stream supply to a resettlement area which was, after treatment, connected to the urban distribution system. The causes of the remaining 33 sub-standard tap samples were all traced to defective inside services or dirty privately owned storage tanks. In such cases the owners were required to effect the necessary repairs, the services were sterilized and subsequent samples taken to prove the effectiveness of the remedial measures.
309. Samples subject to chemical analysis proved satisfactory without exception.
310. The following table shows the quantity of raw and filtered water pumped in comparison with that for the previous year:
1960-61 1959-60 Increase Raw Water million gallons 17,111 11,912 5,199 Filtered Water million gallons 11,873 8,992 2,881 Total million gallons 28,984 20,904 8,080311. The 26% increase over the previous year must be largely attributed to the additional water available from China and the River Indus.
312. The activities of the Waste Detection Section included the detection and repair of defective valves, house connexions, tracing of leaks in the distribution system, investigating high consumptions of individual consumers, and unauthorized usage of water.
313. Correction of faults resulting from tests and investigations produced a saving estimated at 15,000 gallons per hour.
314. The following table gives the position over the last three years:
Year New Meters Installed Mainland Island Total Meters in Service 1958-59 2,950 1,692 4,642 68,601 1959-60 2,267 1,073 3,340 71,941 1960-61 4,874 1,107 5,981 77,922Page 81
308. Of 367 samples taken from service reservoirs and 1,050 samples taken from consumers, only 2% and 5% respectively produced results below the required standard. Where sub-standard samples were recorded from service reservoirs, the chlorine dosage was temporarily increased and subsequent samples proved satisfactory. The unsatisfactory
tap samples included five taken from a partially treated stream supply to a resettlement area which was, after treatment, connected to the urban dis- tribution system. The causes of the remaining 33 sub-standard tap samples were all traced to defective inside services or dirty privately owned storage tanks. In such cases the owners were required to effect the necessary repairs, the services were sterilized and subsequent samples taken to prove the effectiveness of the remedial measures.
309. Samples subject to chemical analysis proved satisfactory with- out exception.
Pumping
310. The following table shows the quantity of raw and filtered water pumped in comparison with that for the previous year:
1960-61 1959-60
Increase
Raw Water million gallons
Filtered Water million gallons
Total
million gallons
17,111
11,873
28,984
11,912
8,992
20,904
5,199
2,881
8,080
311. The 26% increase over the previous year must be largely attri- buted to the additional water available from China and the River Indus.
Waste Detection
312. The activities of the Waste Detection Section included the detection and repair of defective valves, house connexions, tracing of leaks in the distribution system, investigating high consumptions of individual consumers, and unauthorized usage of water.
313. Correction of faults resulting from tests and investigations produced a saving estimated at 15,000 gallons per hour.
Metered Services
314. The following table gives the position over the last three years:
Year
New Meters Installed Mainland Island
Meters in
Total
Service
1958-59 ...
2,950
1,692
4,642
68,601
1959-60 ...
2,267
1,073
3,340
71,941
1960-61 ...
4,874
1,107
5,981
77,922
60
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