WATER SUPPLY COMMITTEE.

Globe, Volume XX, Issue 1590, 25 March 1879, Page 2

WATER SUPPLY COMMITTEE.

The water supply committee met this morning at ten o’clock, when several reports were considered in relation to the pressure to be obtained from an 1 Sin-pipe laid into Christchurch from the site known as No. 6 well on the Waimakariri river. Mr E. Dobeon sent in a lengthy report, from which we take the following extracts :—“ Assuming tho site of No. 6 well to be 400 feet above the level of the roadway at Cathedral square, and the distance to be seventeen miles, the pressure upon a valve closing the main at its lower end, us shown by a pressure guuge fixed on the pipe, would be nearly 1731b5. to tho square inch. If instead of being closed, the end of the pipe were left open, so that the water would d.schargo freely as into a (ank placed below it, tho amount of water so discharged would be at the rate of 2500 gals, per minute, and the pressure on tho guago would fall 1o zero.” Further on, he says: —“Assuming the daily requirements of Christchurch and its suburbs for all purposes to bo 1,000,000 cals, which is equivalent to a daily supply of 30 gallons per head for u population of a little over 33,000 people, and assuming that of this quantity 500,000 gallons a'-e consumed between (I a.m. and 11 a.m.; 250,000 gallons between 11 a m. and 0 p m,, ro d the remaining 250,000 gals, between (! p.m. and (> a.m.—the greatest rate of supply, namely, from 0 a.m. to 11 a.m., would be 100,000 gallons per hour, or 16(10 gallons per minute ; and this quantity would be delivered with a pressure in the sub-mains of about 751bs

to the sq uaro inch. In conclusion the report advises “ i hat, subject to the distance and height of No. ft well being as above assumed, anlßin, main will be amply sufficient for all present requirements of Christchurch, pro. vid-d only t hat the supply at the source is equal to its estimated delivery.” Other reports were read on the subject. Mr H. R, Huddleston arrived at the following result: — Discharge (through an 18in. main) per minute, 2478 gals. ; discharge per twentyhours, 3,568,320 gals.; pressure, 1731b5. to the square inch ; height of jet, 105 ft. The City Engineer reported that an 18-in. pipe laid from’No. 6 well to Christchurch would deliver at ground level in Cathedral square about 2500' gallons per minute, equal to 3,(500,000 gallons per twenty-four hours, and that the pressure to be obtained from the 400 ft. head at disposal would bo 1731bs to tha square inch. The committee accepted the tender of Mr J. Anderson for east iron cylinders, his being the only tender sent in.