. Principi di Ingegneria di irrigazione, terre aride, approvvigionamento idrico, storage works, dighe, canali, acqua diritti e prodotti. y essere citata diga theTabeaud in California, 123 ft. alta, 635 ft. lungo e contenente370,350. cu yd., anche il San Leandro Dam in California, 125 ft.alta, 500 ft. lungo e contenente 542,700. cu yd. 15 CAPITOLO XVROCK-FILL dighe Descrizione.-un rock-diga di riempimento è costituito essenzialmente da una barriera di orembankment sciolto roccia con il suo up-stream faccia rivestita con strato animpervious o coperta. È la funzione della roccia partedell la struttura di resistere alla pressione dell'acqua e

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. Principles of irrigation engineering, arid lands, water supply, storage works, dams, canals, water rights and products. y be cited theTabeaud Dam in California, 123 ft. high, 635 ft. long and containing370, 350 cu. yd., also the San Leandro Dam in California, 125 ft.high, 500 ft. long, and containing 542, 700 cu. yd. 15 CHAPTER XVROCK-FILL DAMS Description.—A rock-fill dam consists essentially of a barrier orembankment of loose rock with its up-stream face covered with animpervious layer or blanket. It is the function of the rock portionof the structure to resist the pressure of the water and hold in posi-tion, against this pressure, the water-tight face, which in realityforms the dam. The rock section of the dam may consist of large and small stonesdropped or dumped into place with little or no attempt at systematicarrangement, each stone being allowed to take its own position.The width of base of the rock barrier is sufficient so that the weightof the stones and the friction between them prevents any tendencyof the structure to overturn, or its parts to slide on each other. As High WaterBplUTOf Cteat. 30 Trenoh to be Dug to/Bock and lUrUled ^ (See SpecincatiotiB Par, ) Typical Section of £artli andBocb-Fni Dam Fig. 46.—Typical section of earth and rock-fill dam, Clear Lake dam, Klamath Project, Oregon. compared to an earth dam, each component part or stone is relativelylarge and heavy. It is, therefore, held in place by its weight andalso by the rough or angular projection of its neighbors. The water-tight portion or face of the dam may be of variousmaterials, such for example, as wood, steel, concrete or earth. Themore common of these, especially for dams constructed during thepast few years, is earth; The thickness of this earth coveringis made to vary slightly, due to the character of materials availableand other local conditions. Its thickness also increases from thetop to the base of the dam as shown in Fig. 46. For high dams the 226 ROCK-FILL DAMS 227 ea

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• booksubjectirrigat
• bookyear1913