File:Pacific service magazine (1924) (14781728255).jpg

Identifier: pacificservicema1627paci (find matches)
Title: Pacific service magazine
Year: 1912 (1910s)
Authors: Pacific Gas and Electric Company
Subjects: Pacific Gas and Electric Company Electric utilities Electrical engineering Public utilities
Publisher: San Francisco : Pacific Gas and Electric Company
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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ethe two halves of the dam. Between thiswall and the right abutment will be theoverpour section of the dam, with heavysteel roller tjpe gates surmounting its crest.From the Avail back for a distance of 200feet on the flatter left hillside will be a non-overpour concrete barrier. The dam willrise sixty feet above the surface of thestream and will have a total width of 430feet, the overpour section being 150 feetin width. There will be a large amount ofdifficult excavation for the foundation andabout 50,000 cubic yards of concrete will berequired for the construction of this dam.The reservoir created by the raising of thewaters will be of 2,000 acre feet capacityand will serve as an afterbay for Pit No.Three as well as a forebay for Pit No.Four. As at Pit No. Three, in order to enablethe construction of the permanent dam foun-dation on dry bedrock there is in process oferection a temporary dam by which theriver will be diverted into a timber flumewhich will carry the water past the per-
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Temporary diversion dam nearing completion.First section of flume in place. 204 Pacific Service Magazine manent dam site to a pointbelow where it will be re-turned to the stream. Thistemporary dam is of rock-crib construction. Theflume leading from thiswill be 11 feet deep and24 feet wide, sufficient tocarry a volume of 3500second feet of water, morethan the usual flow of theriver between May 1stand December 1st. Thetemporary dam is located500 feet up-stream fromthe permanent dam site.The temporary diversionflume will be about 1600 feet in length, itslower end being about 900 feet below thetoe of the permanent dam. The entrance to the tunnel will belocated 100 feet up-stream from the per-manent dam. It will be 23,782 feet inlength, 19 feet in diameter, of 3000 secondfeet capacity, and can be driven from fourheadings. The intake at the head of thetunnel will be of the same general type asthat of Pit No. Three, At a point near the power-house end ofthe tunnel a short branch will connect

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