The Pamphlet Collection of Sir Robert Stout: Volume 12
Chapter V. — Water Supply, &c
Water Supply, &c.
Dunedin is supplied by gravitation through leaden service pipes from a reservoir capable of holding 51 million gallons. This reservoir is filled by Ross' Creek, the which creek is formed by the union of several streams which take their rise in the Flagstaff Range. The reservoir is 50 feet deep, has a catchment drain on one side, and a storm-water channel on the other in order to prevent extraneous matter from filtering into it. Any impurities which enter it come from the banks of Ross' Creek, and possibly from the gathering ground I he daily consumption per head is 50 gallons, but from this we must take the water supplied to manufactories. By and by, we will be able to do this, as metres are about to be established.
The city of Glasgow supplies 50 gallons per individual, but on the other hand London only supplies about 25 gallons and Edinburgh 35.*
I am informed by Mr. M'Gregor, C.E., that improvements are about to be made, so that soon we shall have a larger and purer supply, the present difficulty being that the land through which Ross' Creek runs cannot be manipulated, as it belongs to a party who has hitherto refused all offers to purchase. Mr. M'Gregor thinks that now the water supply is in the hands of the Corporation, this difficulty may shortly be overcome, in which case filter beds could easily be constructed. At present the water, though tolerable, is not pure, for according to Dr. Black's last analysis there were 0.95 grs. of organic matter per gallon in the lower reservoir. This is 0.16 less pure than London Water.
* Haskoll on Engineering.