. Electrical world. many years the government has maintained a dam at this point,and a sluicewaj to facilitate the running nf logs, and the place was April 2, 1904. ELECTRICAL WORLD and ENGINEER. 643 once the site of a small mill, which, however, utilized but little ofthe power available. The flowage of the river when last measuredwas somewhat under 600 second-feet, and the fall from the spillwayof the dam to the surface of tail water when operations were com-menced was about 17 ft. After careful consideration, it was decided to raise the dam 18 in.,and by blasting out a ridge in the r
. Electrical world. many years the government has maintained a dam at this point,and a sluicewaj to facilitate the running nf logs, and the place was April 2, 1904. ELECTRICAL WORLD and ENGINEER. 643 once the site of a small mill, which, however, utilized but little ofthe power available. The flowage of the river when last measuredwas somewhat under 600 second-feet, and the fall from the spillwayof the dam to the surface of tail water when operations were com-menced was about 17 ft. After careful consideration, it was decided to raise the dam 18 in.,and by blasting out a ridge in the river below, lower the tail-water The south wing wall was deflected at a right angle and carrieddown stream about 35 ft. to form the west wall of the sluiceway atthe west end of the main dam, thus making it feasible at anyfuture time to remove the main dam and replace it with a concretestructure without interrupting the continuous operation of the north wing wall was extended out 15 ft. beyond the up-stream. FIG. 4.—EXCAVATING THE TAIL-RACE. 3 ft., giving a total head of 212 ft. With these changes it was con-sidered feasible to develop a maximum of 1,200 hp, and the work ofdesigning the plant and supervising its construction was placed inthe hands of the writer. Referring to the sketch map at the beginning of this article, show-ing the falls and their immediate surroundings, it will be seen thatthe river flows in a southerly direction, and just below the falls,expands into a sort of basin or lagoon lying somewhat west of thegeneral course of the stream. The government works, most ofwhich have been utilized, consisted of a wood dam at the top ofthe falls proper, and a timber crib connecting with it, extending upand down the stream and confining the water to the easterly chan-nel. The dam is provided with a sluiceway at each end and extensiverunways for the passage of logs. The plan of development included a tail-race and wheel-pit to be nC. 6.—SETTING THE DRAFT TUBE
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
