Water-power; an outline of the development and application of the energy of flowing water . for tram-cars were carriedacross the dam on trestles, which were lengthened upward asthe dam rose, leaving the posts imbedded in the the up-stream face a trench was excavated 3 to 12 feetdeep, 5 feet wide, into the bed-rock, and filled with rubblemasonry laid in Portland cement, forming a footing to connectthe plank facing with the bottom and sides of the 6 X ^ inches were imbedded to a depth of 4 inches inthe slanting face of the dam, running up and down, 5 feetapart. To t
Water-power; an outline of the development and application of the energy of flowing water . for tram-cars were carriedacross the dam on trestles, which were lengthened upward asthe dam rose, leaving the posts imbedded in the the up-stream face a trench was excavated 3 to 12 feetdeep, 5 feet wide, into the bed-rock, and filled with rubblemasonry laid in Portland cement, forming a footing to connectthe plank facing with the bottom and sides of the 6 X ^ inches were imbedded to a depth of 4 inches inthe slanting face of the dam, running up and down, 5 feetapart. To these timbers plank are spiked to form the water-tight skin of the dam. The plank arc 3 inches thick on thelower third, 2 for the middle, and \^ for the upper. Thisplank facing is carried up to a height of 3 feet above the topof the dam, 9 feet above the sole of the wasteway. The spacebetween the planking and the wall is packed with sluice is a 24-inch vitrified sewer-pipe imbedded in con-* Eighteenth Annual Report U. S. Geol. Survey, Part IV, PI. XLIX. 194 RESER LONGITUDINAL SECTION15 20 SCALE OF FEET ROCK-FILL DAMS. 195 Crete. It is closed by a sliding gate which is operated b}- arod running down the inclined face of the dam. Fig. 89 is asection of the ravine and wasteway, 89^7 plan of same, 89/;section of dam through sluice. 89^ shows plank facing, 89^^/rubble trench and footing. This dam has been in use since1895. Figs. 90, a, by c, d, represent a dam of a still more startlingcharacter, the impervious skin consisting of a steel diaphragmextending entirel}- across the valley from top to bottom. Thisdam was under construction at last accounts and is presumednow to be completed. The details are obtained from thesame source as in the former case,^ and we cannot do betterthan use the language of the Report: One of the most interesting and remarkable dams nowunder construction is located 20 miles southeast of San Diego,California, about 10 miles back from
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthydraulicengineering
