CANADIAN SOCIETY OF CIVIL ENGINEERS. LIST OF OFFICERS FOR THE YEARS 1887 TO 1890. Members of Council. Secretary. Treasurer... Librarian Canadian Society of Civil Engineers. SESSION 1890. Mohun. TRANSACTIONS. Thursday, 2nd January. P. A. PETERSON, Vice-President, in the Chair. VANCOUVER WATER WORKS. DISCUSSION. The author, in his very interesting and comprehensive paper, gives the average velocity of the Capilano River for the first seven miles from its mouth at five feet a second. A difficulty has been frequently encountered, notably in the precipitous mountain ranges of the Pacific Coast,-in maintaining impounding reservoirs in somewhat similar situations. In these torrential streams it has been found that the boulders and gravel washed from the banks and bed above the dam are liable to be swept down and gradually fill the reservoir. A velocity of five or six feet a second will move good sized boulders, and less than half that velocity will move gravel. From the author's description of the bed of the stream, it would appear that the velocity has been great enough to remove most of the gravel from the channel, except at points where from the formation of the banks slack water was encountered. On the other hand, as even the most sanguine Vancouverites do not anticipate a population of four or five millions requiring a daily supply of 440 millions of gallons, a storage reservoir, as such, is not an essential, provided means are adopted to keep the entry conduit clear. The steel mains which were built and laid by the Albion Iron Works Company of Victoria did not when first laid give satisfaction. Many were leaky, and considerable damage was done to the streets. Α |