San Francisco : Architect and Engineer, Inc · leaf 743
ed with a double layer of 2 in.plank, with a layer of tarred burlap between. A maximum head of 13 ft.over the top of the tunnel was provided to dispose of the flood waters. A concrete dam was built just up-stream from the lower portal ofthe diversion tunnel, to prevent water discharged through the… … HETCH-HETCHY DAM CONSTRUCTION, SHOWING BOTTOM OF FOUNDATION The contract for the construction of the initial development of theHetch Hetchy dam was awarded on Auff. 1, 1919, to the Utah Construc-tion Co., at a total estimated price of $5,447,972. The principal itemswere: , Unit prices Approximate…
Architecture · Building
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