. Principles of irrigation engineering, arid lands, water supply, storage works, dams, canals, water rights and products. oreven more. As soon as possible after leaving the foot of the bankthe stream is conducted into wooden flumes, the process beingassisted by one or more men using long-handled shovels or forks tokeep the water and stones moving along and remove obstacles whichcollect in the stream, as shown on Plate XIII, Fig. C. The slope of the flumes must be carefully adjusted to maintain avelocity sufficient to keep the material from being deposited. Theyare continued on trestles out to
. Principles of irrigation engineering, arid lands, water supply, storage works, dams, canals, water rights and products. oreven more. As soon as possible after leaving the foot of the bankthe stream is conducted into wooden flumes, the process beingassisted by one or more men using long-handled shovels or forks tokeep the water and stones moving along and remove obstacles whichcollect in the stream, as shown on Plate XIII, Fig. C. The slope of the flumes must be carefully adjusted to maintain avelocity sufficient to keep the material from being deposited. Theyare continued on trestles out to the site of the dam and branches EARTH DAMS 217 are provided commanding the entire foundation. Gates or openingsin the sides of these flumes are provided at the necessary points fordischarging the water near the upper and lower faces where thelarger stones are needed. From these points the smaller stones andfine material are carried inward toward the center of the the axis of the dam the muddy water is held temporarily in asmall pond in which the finer sediment is deposited thus forminga water-tight J Uhannel^460 («.) ^ Drill Holes Scale of Feet n Test Pits ^° P 6£_H2_LSO c. Points of Control -^ Bock Outcrop fttVitrified Drain Pipe (Item 10 Schedule 1)//////A Concrete Slope Fig. 42.—General plan of Conconully Dam, showing location of spillway andoutlet works, Okanogan Project, Washington. As a result of careful manipulation of the flumes the large rocksare deposited on the outside of the dam, the smaller stones andgravel inside of this and the finest sand and sUt in the center or nearthe up-stream face. To bring about this result the flumes are shiftedinward on the dam as the structure increases in height; finally asingle flume deposits the last of the material on the crest, resulting 218 PRINCIPLES OF IRRIGATION ENGINEERING in a symmetrical structure as shown on Plate XIII, Fig. D. Thegeneral plan of the particidar work shown in this plate is gi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectirrigat, bookyear1913
