Canadian engineer . theoverflow water to go directly to the lower pool; the rocky June 20, 1912. THE CANADIAN ENGINEEa 831 ridg-e between the middle and lower pools has been removedand the difference in level gained for the lower head. The canal entrance widens out to form an intake whichis protected with four sets of racks supported by the con-crete piers. The photograph of the intake shows the piersand framing for racks and further shows the canal in thebackground. Racks are of iron with wooden tops extendingout of the water so that the frost from the air cannot beconducted to the iron porti
Canadian engineer . theoverflow water to go directly to the lower pool; the rocky June 20, 1912. THE CANADIAN ENGINEEa 831 ridg-e between the middle and lower pools has been removedand the difference in level gained for the lower head. The canal entrance widens out to form an intake whichis protected with four sets of racks supported by the con-crete piers. The photograph of the intake shows the piersand framing for racks and further shows the canal in thebackground. Racks are of iron with wooden tops extendingout of the water so that the frost from the air cannot beconducted to the iron portion in winter, thus preventing thefreezing up of the openings between rack bars- The con-crete is built up on the solid bed rock and continues alongas lining for the canal to the forebay. Stoop log seats arearranged at the entrance from intake to canal so that thehead-water can be shut off entirely from the canal. A sluicerun has been excavated alongside the intake in the riverbed to take care of the ice and Plan Showing Cenerai> Layout of Headworks andGenerating Station. The canal is about 500 feet long and terminates in aforebay from which tWO steel penstocks, nine feet in di-ameter, lead down to the power house. The forebay is pro-tected by a housing which will be heated in extreme weather;a curtain of 8 x 10 timber extends from the housing sillsdownwards into the water and both encloses the air spacein the forebay and acts as an ice and trash boom in frontof the racks. A spillway with adjustable stop-logs, forwardof the curtain, regulates the water level and dischargesdebris; a small sluiceway is placed in front of the racks,in the housed portion, and carries out any debris caught bythe racks. Both spillway and sluice discharge into a naturalgrully in the rock and flow down to the lower pool. Theracks are of iron bars arranged for easy handling and rak-ing. The penstock entrance has a large bell-shapel mouthabout 13 feet in diameter; stop-logs with handling winch
Size: 1350px × 1850px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
