San Francisco : Architect and Engineer, Inc · leaf 546
diameter or twotunnels of 10 ft. 3 in. diameter. On com-paring the cost of a 13 ft. tunnel with thatof a 10 ft. 3 in. tunnel now plus the dis-counted cost of a second parallel one to be in San Mateo County. This latter is theprincipal reservoir on the San Franciscopeninsula of the Spring Valley… … LAKE ELEANOR DAM, HETCH HETCHY PROJECTThe buttressed arches are 1,260 feet long and 70 feet high constructed many years in the future, it isevident that the dual constructi(Mi is themore economical by at least $5,000,000. When the construction of the presenttunnels shall have been under way for…
Architecture · Building
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