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pg 028: The Austin dam Publication 2564523.

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28

dam, along the line HM in fig. 5, and settled. The earth east of the east end of the head gate settled for a distance of 25 feet. Plans were immediately adopted for raising and strengthening the cofferdam so as to provide against floods, for rebuilding the head gate, and for the construction of a power-house foundation. The broken part of the head-gate masonry was removed (leaving only that over penstocks 1

Fig. 5-Section and sketch of plan of bulkhead, showing location of power house and penstocks. HK is bottom layer of concrete filling resting on hard limestone strata; HM is line of crack; RS is the original level of bulkhead masonry; RSTU is tunnel (6 feet by 6 feet by 60 feet long) filled with concrete; A is point hwere dfirft indicated leak in the spring of 1899; B is location of leak discovered in the fall of 1899; P is point from which view shown in Pl. VII, B, was taken; FG is wing wall; C is 10-inch horizontal pipe projecting from wall of power house, known as the spring; D is cememnt chamber for controllin water and directing penstick was found in Februrary, 1900.

and 2), and an excavation nearly 200 feet long and 70 feet deep, with an average width of 7 feet, was made. This trench reached to a level of 57 feet below the crest of the dam, or within 3 feet of the level of the toe. The head-gate masonry was rebuilt, provision being made for only seven 9-foot penstocks, the rest of the excavation being filled by a concrete wall 112 feet long, which was 8 feet thick for the 90

 

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