Electrical news and engineering . onal water diverted by thetemporary flume through and over the site of the new dam,while the footings were being excavated and concreted to this, avalanches above, causing sudden rises andfalls for which the stream is noted, and unusually highwater during the winter, were a constant menace to theprogress of the work. Water was diverted by coffer dam tothe south side of the expansion joint and the central partof the dam built up to an elevation of one hundred feet be-tween the expansion joint and the power and diversionflumes. These were built on the s
Electrical news and engineering . onal water diverted by thetemporary flume through and over the site of the new dam,while the footings were being excavated and concreted to this, avalanches above, causing sudden rises andfalls for which the stream is noted, and unusually highwater during the winter, were a constant menace to theprogress of the work. Water was diverted by coffer dam tothe south side of the expansion joint and the central partof the dam built up to an elevation of one hundred feet be-tween the expansion joint and the power and diversionflumes. These were built on the slide rock from the rail-way cutting above, and it was a difficult problem to carrythem over the dam site. A concrete cut-off wall under theunwatering flumes was built on the line to the north was found impossible to complete this portion of the damfurther, until the last thing in the spring, after the footingson the south side had been obtained by diverting the waterby a second coffer dam into the 8 x 12 sluice above men-. Sectional Plans showing Largi- Shiiceway, Special Rack Design for Handling Frazil, etc. exciter operating at a speed of 600 This unit wasdesigned to operate under a head of seventy-three feet andcarry the full lighting and power load. With overload thiswould carry the normal increase of the city lighting, andsome additional power, for another year or two. The bal-ance of the plant was designed to operate as an auxiliaryuntil the old flume was useless, at which time penstock would be built and connected up with a new turbine to250 unit, which will then complete unit No. 2. Theother extensions have already been of PlantThe construction of the dam in the canyon was inter-esting and difficult owing to the fact that the work had tobe done during low water in the winter time with only lim-ited time for completion, and the difficulties which obtaineddue to necessity for keeping the present power plant running tioned.
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