File:Pacific Gas and Electric magazine (1912) (14597473687).jpg

Identifier: pacificgaselectr41913paci (find matches)
Title: Pacific Gas and Electric magazine
Year: 1909 (1900s)
Authors: Pacific Gas and Electric Company
Subjects: Pacific Gas and Electric Company Electric utilities Public utilities
Publisher: (San Francisco, Calif.) : Pacific Gas and Electric Co.
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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lume raised abovethe river-bed until such time as the dam couldbe brought up to sufficient height to afford awide enough crest to leave room for construc-tion operations as well as spillway width. Records of the flow of the South YubaRiver kept by this company for the last sevenyears tend to show a low flow of but a fewsecond feet and a maximum flow of not morethan a few hundred second feet up to Decem-ber I st of any year, while Spring floods of asmuch as 3,000 second feet or more are notuncommon. Due to the narrowness of the gorge it wasconsidered practically impossible to divert theSpring floods from the river-bed and still leaveroom to work therein, but by raising the damto a height of 25 feet a crest width of 100feet could be obtained. This would be suffi-cient to provide spillway room through thepermanent concrete structure for all stages ofthe river and still leave considerable portionsof the concrete mass free of water to be car-ried on up. 303 Pacific Service. Magazine \/Sski
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Diverting dam and flume during the flood. As it was not decided to undertake thisproject until late in the Spring, it was not pos-sible to take advantage of the low flow of thestream, but it was thought that 600 secondfeet could be easily and safely handled. Ittherefore seemed imperative to raise the damto this height of 25 feet during the late fall,say before the first of December, thus provid-ing spillway for the Spring floods and en-abling work to be recommenced in the earlySpring with the first melting of the snows. If, on the other hand, it should be foundimpossible to divert the water before the win-ter season set in, it could in all probability notagain be undertaken until well towards thesummer of the succeeding year at such timeas the stream should again fall, probablyabout the first of July. This meant lengthen-ing by several months the winter period of in-action, and a delay in the ultimate completionof the installation for perhaps a full addi-tional year with its attendant

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