Correspondence. The Works for the Supply of Water to the City of Birmingham From Mid Wales.

Abstract

Proceedings.] THE CITY OF BIRMINGHAM FROM MID-WALES. '73were used in place of bends, on all horizontal and vertical curves Mr. Bruce. of the 48-inch siphons, and were found to work satisfactorily. Mr. Bruce had once had to carry a 32-inch main, conveying water from Tchar Lake to Bombay, over the Kurla Creek, which was used by salt-barges.H e adopted a hydraulic arch, somewhat similar to that described in the Paper, of flanged steel pipes, springing from heavy castings bolted down to brick wells filled with concrete, and with an air-valve at the summit. Referring to the filteringmaterials, it would have been more economical to adopt the plan of covering the floor with bricks on edge, covered with others laid flat, and spreading upon the latter 3 inches of each of the two finer grades of gravel, which, while saving 18 inches in the depth of the beds, would have been equally efficient.The rate of filtration adopted seemed very slow considering the purity of the water.