Removing Hills by Hydraulics.
In building both Seattle and Portland it was necessary to remove from the faee of the earth several sizeable hills. This work was done, for the most part, by hydraulic power. That is (says the NewYork “Tribune”) the hills, composed mostly of dirt, were washed away by powerful streams of water. At Portland (Oregon) electric power, driving huge centrifugal pumps, lifted water from Guild’s Lake 400 ft up-hill and hurled it through 4Jin nozzles against the great piles of dirt and gravel. In this way the hills are washed away much quicker and cheaper than they could be cut up and earted away with steam shovels and dirt trains.
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https://paperspast.natlib.govt.nz/periodicals/NZGRAP19120626.2.17
Bibliographic details
New Zealand Graphic, Volume XLVII, Issue 26, 26 June 1912, Page 6
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113Removing Hills by Hydraulics. New Zealand Graphic, Volume XLVII, Issue 26, 26 June 1912, Page 6
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