. Journal of the New England Water Works Association . 338 THE NEW WATER SUPPLY OF THE CITY OF wixsok. 339 encountered in the excavations so far made agree very closely with thoseindicated by the borings. The underlying rock is a granitic gneiss of fairlyuniform quality and no fault appealed in the bottom of the rock valley. The control of the stream during construction was accomplished bydiverting it into a horseshoe shaped conduit 25 ft. wide by 21 ft. 4 in. highand 102 ft. Long passing through and under the dam, with its bottom eleva-tions substantially the same as the old rive
. Journal of the New England Water Works Association . 338 THE NEW WATER SUPPLY OF THE CITY OF wixsok. 339 encountered in the excavations so far made agree very closely with thoseindicated by the borings. The underlying rock is a granitic gneiss of fairlyuniform quality and no fault appealed in the bottom of the rock valley. The control of the stream during construction was accomplished bydiverting it into a horseshoe shaped conduit 25 ft. wide by 21 ft. 4 in. highand 102 ft. Long passing through and under the dam, with its bottom eleva-tions substantially the same as the old river bed. This conduit is foundedupon ledge rock and i< connected with the river by approach and dischargechannels about 1 000 ft. and 200 ft. long respectively. The approach chan-nel is lined with concrete up to the height of ordinary river flows, mainlywith the idea that the percolation into the deep portions of the core trenchduring construction might he reduced thereby. The upstream and down-stream sides of the deep excavations are guarded by earth embankmentsforming the toes of the dam and referre
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