Transactions of the American Society of Civil Engineers, Vol. Lxviii, Sept. 1910

Cover Transactions of the American Society of Civil Engineers, Vol. Lxviii, Sept. 1910
Transactions of the American Society of Civil Engineers, Vol. Lxviii, Sept. 1910
Noble Alfred
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--Typical Tunnel Sections] As already stated, the grade of 1. 5% from Fifth Avenue eastward wasfixed with reference to the lowest point of the river bed in order togive the requisite cover over the tunnels at the deepest point of thechannel on the west side of the reef, where the river bottom was about60 ft. Below mean high tide for a short distance. On the other hand, asthe use of compressed air in building the tunnels was anticipated, anexcessive depth below the water surface was to be avoide...d as far aspossible; it was necessary, however, to continue the descending gradesome further distance until the tunnels were mostly in rock, so thatdrainage sumps under the tunnels could be made readily. Eastward fromthe sumps the tunnels had a rising grade of 0. 7% to the establishedbulkhead line on the Long Island side, giving a cover at the pointswhere the tunnels enter rock, a short distance westward, of about 10 ft. (if the dredging plane should be fixed at some future time at 40 ft. Below mean low tide, as may be reasonably anticipated).

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