1950 — Page 76

Public Works Department Annual Report 工務司署年報 All AI Reviewed
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# TABLE IV. QUALITY OF WATER. SUMMARY OF WATER ANALYSES FOR 1949/1950.

Type of Water Locality Bacteriological Analyses Total No. of Samples examined Number shewing B. Coli present in:- 10 cc or less 16.6 cc 25 cc 33 cc 50 cc 100 cc

Raw. Island Mainland Total 197 49 246 169 37 206 2 6 18 24 Filtered but Unchlorinated. Island Mainland Total 198 50 248 72 3 75 20 4 24 30 5 35 31 ... 31 Filtered and Chlorinated. At Service Reservoirs. Island Mainland Total 228 50 278 1 Filtered and Chlorinated. From Taps. Island Mainland Total 482 190 672 224 26 250 22 1 23 11 2 13 2 2 1 1

Type of Water Locality Physical & Chemical Analyses Total number of Samples examined Number shewing B. Coli absent in: 22 cc 50 cc Number & Percentage shewing B. Coli absent in 100 cc Number found satisfactory

Raw. Island Mainland Total 96 26 122 8 2 10 20 20 18 Filtered but Unchlorinated. Island Mainland Total 65 65 Filtered and Chlorinated. At Service Reservoirs. Island Mainland Total 122 26 148 122 26 148 105 26 131 104 26 130 50 21 71 (99%) 100% 1 ... 1 Filtered and Chlorinated. From Taps. Island Mainland Total 417 180 597 208 45 253 208 45 253 208 23 231 (87%) (95%) 208 45 253

Standards of purity aimed at:—
Raw water B. Coli absent in 22 cc.
Filtered unchlorinated water B. Coli absent in 50 cc.
Filtered and chlorinated water B. Coli absent in 100 cc.

NOTE: Bad tap samples were found to be due mainly to unclean and corroded storage tanks and inside services. In every case chlorination was carried out and notices served on the consumers concerned to take remedial action.

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# TABLE IV. QUALITY OF WATER. SUMMARY OF WATER ANALYSES FOR 1949/1950. Type of Water Locality Bacteriological Analyses Total No. of Samples examined Number shewing B. Coli present in:- 10 cc or less 16.6 cc 25 cc 33 cc 50 cc 100 cc Raw. Island Mainland Total 197 49 246 169 37 206 2 6 18 24 Filtered but Unchlorinated. Island Mainland Total 198 50 248 72 3 75 20 4 24 30 5 35 31 ... 31 Filtered and Chlorinated. At Service Reservoirs. Island Mainland Total 228 50 278 1 Filtered and Chlorinated. From Taps. Island Mainland Total 482 190 672 224 26 250 22 1 23 11 2 13 2 2 1 1 Type of Water Locality Physical & Chemical Analyses Total number of Samples examined Number shewing B. Coli absent in: 22 cc 50 cc Number & Percentage shewing B. Coli absent in 100 cc Number found satisfactory Raw. Island Mainland Total 96 26 122 8 2 10 20 20 18 Filtered but Unchlorinated. Island Mainland Total 65 65 Filtered and Chlorinated. At Service Reservoirs. Island Mainland Total 122 26 148 122 26 148 105 26 131 104 26 130 50 21 71 (99%) 100% 1 ... 1 Filtered and Chlorinated. From Taps. Island Mainland Total 417 180 597 208 45 253 208 45 253 208 23 231 (87%) (95%) 208 45 253 Standards of purity aimed at:— Raw water B. Coli absent in 22 cc. Filtered unchlorinated water B. Coli absent in 50 cc. Filtered and chlorinated water B. Coli absent in 100 cc. NOTE: Bad tap samples were found to be due mainly to unclean and corroded storage tanks and inside services. In every case chlorination was carried out and notices served on the consumers concerned to take remedial action.
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Type of Water Locality 65 TABLE IV. QUALITY OF WATER. SUMMARY OF WATER ANALYSES FOR 1949/1950. Bacteriological Analyses Total No. of Samples examined Number shewing B. Coli present in:- 10 cc or lese 16.6 cc 25 ec 33 cc 50 ce 100 ee Island 197 169 2 18 Raw. Mainland 49 37 Total 246 206 6 24 Island 198 72 20 30 31 Filtered but Mainland ... 50 3 4 5 www.y Unchlorinated. Total Physical & Chemical Analyses Number shewing B. Coli absent in: 22 cc | 50 cc Number & Percentage shewing B. Coli absent in 100 ce Total number of Samples examined 8 2 10 96 26 122 Number found satis- factory 45 96 96 20 20 18 248 75 24 35 51 63 Island 228 1 Filtered and Chlorinated. Mainland 50 At Service Reservoirs. Total 278 Island 482 Filtered and Chlorinated. Mainland 190 224 22 11 2 2 From Taps. Total 672 26 1 13 פט 1 26 26 122 122 225 99% 105 104 50 100% 26 26 1 --- 275 99% 131 130 21 417 87% 208 208 2 180 95% 45 45 23 597 89% 253 253 Standards of purity aimed at:— Raw water B. Coli absent in 22 .cc. Filtered unchlorinated water B. Coli absent in 50 ce. Filtered and chlorinated water B. Coli absent in 100 ce. NOTE: Bad tap samples were found to be due mainly to unclean and corroded storage tanks and inside services. In every case chlorination was carried out and notices served on the con- sumers concerned to take remedial action.
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Type of Water

Locality

65

TABLE IV.

QUALITY OF WATER.

SUMMARY OF WATER ANALYSES FOR 1949/1950.

Bacteriological Analyses

Total No. of Samples examined

Number shewing B.

Coli present in:-

10 cc or lese

16.6 cc

25 ec 33 cc

50 ce

100 ee

Island

197

169

2

18

Raw.

Mainland

49

37

Total

246

206

6

24

Island

198

72

20

30

31

Filtered but

Mainland ...

50

3

4

5

www.y

Unchlorinated.

Total

Physical & Chemical Analyses

Number shewing

B. Coli absent

in:

22 cc | 50 cc

Number & Percentage shewing B. Coli absent in 100 ce

Total number

of Samples examined

8

2

10

96

26

122

Number found satis-

factory

45

96

96

20

20

18

248

75

24

35

51

63

Island

228

1

Filtered and

Chlorinated.

Mainland

50

At Service

Reservoirs.

Total

278

Island

482

Filtered and Chlorinated.

Mainland

190

224

22

11

2

2

From Taps.

Total

672

26

1

13

פט

1

26

26

122

122

225 99%

105

104

50

100%

26

26

1

---

275

99%

131

130

21

417

87%

208

208

2

180

95%

45

45

23

597

89%

253

253

Standards of purity aimed at:—

Raw water B. Coli absent in 22 .cc.

Filtered unchlorinated water B. Coli absent in 50 ce.

Filtered and chlorinated water B. Coli absent in 100 ce.

NOTE: Bad tap samples were found to be due mainly to unclean and corroded storage tanks and inside services. In every case chlorination was carried out and notices served on the con- sumers concerned to take remedial action.

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