. Canadian engineer . fthe Lower Fernando will be 700 feet wide at the base, 7,320feet in length, 130 feet in height, and the fill amounts to2,700,000 cubic yards. It is being built by sluicing and ex-clusive of the Gatun dam of the Panama Canal, will be thelargest hydraulic filled dam in existence. This reservoir isat the terminus of the aqueduct and is calculated to affordfour months supply for one million population. Two other January 11) THE CANADIAN ENGINEER large reservoir sites have been surveyed as a part of the gen-eral plan of irrigation, but no work has as yet been under-taken o
. Canadian engineer . fthe Lower Fernando will be 700 feet wide at the base, 7,320feet in length, 130 feet in height, and the fill amounts to2,700,000 cubic yards. It is being built by sluicing and ex-clusive of the Gatun dam of the Panama Canal, will be thelargest hydraulic filled dam in existence. This reservoir isat the terminus of the aqueduct and is calculated to affordfour months supply for one million population. Two other January 11) THE CANADIAN ENGINEER large reservoir sites have been surveyed as a part of the gen-eral plan of irrigation, but no work has as yet been under-taken on their construction. The most important phase of the work, in fact one ofthe controlling factors in the completion of the aqueduct,was the Elizabeth Tunnel. This tunnel was holed Marchist, igii, nearly a year in advance of the estimated time re-quired for its excavation. This tunnel, the second longestwater tunnel in the States, was driven 26,870 feetthrough the hard gneiss rock of the Madre range in. The Intake of the Los Angeles Aqueduct, Eleven Miles Northof Independence, California. the short space of 1,240 working days. The average rate ofprogress from each portal was approximately feet perday. United States tunnel records were repeatedly broken,that of 449 lineal feet in a thirty-day month from a singleheading being advanced to 604 feet for the same work was carried on continuously in three eight-hourshifts from opposite sides of the range, the excavation beingaccomplished with Leyner drills driven by compressed air,and the muck handled by electric motor railways. Through-out the task, the work, excepting the very start, whencrude methods were adopted until the arrival of proper ma-chinery, the most modern electrical equipment was underground and surface forces at each portal averaged100 men throughout the drilling. From the north portal theprogress was made exceedingly difficult by water pocketsand swelling earth, and hea
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
