Further progress report; presented to both houses of Parliament by his excellency's command

 
9781231306383: Further progress report; presented to both houses of Parliament by his excellency's command
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1885 Excerpt: ...and lowest parts of the city. The company is constructing another system, the Crystal Spring, which is to supply all the lower portions of the city. It consists of the following works:--The Upper Crystal Spring Reservoir (in course of construction) will contain 4,000,000,000 gallons, but when the system is completed by throwing a lower dam across the outlet of the Main Valley 38,000,000,000 gallons can be stored, with its surface 305 feet above tide. The company is now making 23 miles of wrought-iron pipe, 44in. diameter, to connect the Upper Crystal Spring Reservoir with the city reservoir. Thirteen miles are ready for use; the remainder will be finished about July. The city-distributing reservoir will have a capacity of 50,000,000 gallons at 170 feet above tide. As this system will supply two-thirds of the district now supplied from San Andres, the duty of this reservoir will be largely reduced. This 44in. pipe-line is being laid with great care, and the work of riveting and caulking seams equals the best boiler work. The whole process of construction in the workshops, and laying, was inspected. The accompanying photographs of the shops of the Risdon Ironworks shows portions of the process. The iron used is of 6 x 7 Birmingham gauge = "203 inch and-18 inch. The head of water is 250 feet, or a pressure of 110 lbs. per square inch. The pipes are coated with the asphalt mixture, as before described, and then coated a second time. This pipe, when laid, cost 5d. per lb. The construction of this pipe line will almost double the water supply. The company also owns and controls a stream and watershed on the east side of the bay of San Francisco, called the Calaveras System (see Plan), which, at a cost of 1,000,000, can be connected with the San Francis...

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