Otago Provincial Gazette – 1859 – No. 91

Page 285

✨ Water Supply Report



285

The former would give sufficient pressure by gravitation for the lower and populated parts of the town, while the latter would do equal service to the higher.

The cost of the works at a, b, c, may be estimated at thirty shillings per head of population to be served; and those at A, B, C, when the population to be served exceeds 10,000, at forty shillings. A much higher estimate would require to be given in the latter works for a smaller population. Thus, were it thought desirable to provide for the present population from the town belt streamlets, only estimated at 1000 individuals, the cost would be £1500; for 2000 individuals £3000, and so forth. Prior to works being undertaken, however, it would be necessary to prepare detailed plans and more minute estimates and specifications; but it is to be hoped that the present report will suffice for initiating measures.

J. T. THOMSON, C.E.
Civil Engineer’s Office,
23rd June 1859.

TABLE A.

Table showing Minimum Water supply of Dunedin from various sources, the data being obtained by gauging the Streams in their average unflooded state.

Name of Stream Width of Weir. Level of Water above Sill. Supply per Minute. Supply per diem in gallons. Population supplied at 30 gals. per head per diem.
Maclaggan Street Streamlet 4 inches 1¼ inches 2.59 cube ft. 28,042 774
London Street do. 2½ „ 7.31 „ 64,599 2,186
Regent Road do. 2¼ „ 7.81 „ 69,997 2,333
North-east Valley Stream 3 feet 3¾ „ 94.80 „ 843,556 28,118
Water of Leith do. 6 „ 338.24 „ 3,033,238 101,108
Kaikorai do. 3 „ 104.79 „ 938,304 31,110
Totals ... ... ... 4,968,936 165,629

TABLE B.

Table showing the Maximum supply of Water from various Streams near Dunedin, the data being area of surface drained and annual rainfall.

Name Discharge per diem, rain fall being 24 in. per Annum. Area of Valley. Discharge per diem, less from absorption and evaporation being deducted. Population supplied at 30 gals. per head per diem.
Maclaggan Street Streamlet ... 100 acres 148,500 4,950
London Street ... 150 „ 222,750 7,425
Regent Road 1485 gallons 120 „ 178,200 5,940
North-east Valley Stream ... 2240 „ 3,326,400 110,880
Water of Leith ... 5440 „ 8,078,400 269,280
Kaikorai ... 1920 „ 2,851,200 95,040
Totals ... ... 14,805,450 gallons 493,515


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VUW Te Waharoa — PDF Otago Provincial Gazette 1859, No 91




✨ LLM interpretation of page content

🏗️ Report on the Water Supply of Dunedin (continued from previous page)

🏗️ Infrastructure & Public Works
23 June 1859
Water Supply, Dunedin, Engineering, Infrastructure, Public Health
  • J. T. Thomson, Civil Engineer

🏗️ Table A: Minimum Water Supply of Dunedin

🏗️ Infrastructure & Public Works
Water Supply, Dunedin, Streams, Population, Infrastructure

🏗️ Table B: Maximum Water Supply of Dunedin

🏗️ Infrastructure & Public Works
Water Supply, Dunedin, Streams, Population, Infrastructure