Water-power; an outline of the development and application of the energy of flowing water . ed, and have shown in some respectsdecided advantages over every other mode of discharge. Thepipe has its influx near the foot of the inner slope, protectedby a screen to exclude floating bodies, passes up the inner anddown the outer slope, discharging into a basin sufficientlyextensive to moderate the commotion of the water. It isadvisable to cover the pipe with puddled earth both on theinner and the outer slope, not only for protection against frost,. Fig. to prevent the influx of air through t
Water-power; an outline of the development and application of the energy of flowing water . ed, and have shown in some respectsdecided advantages over every other mode of discharge. Thepipe has its influx near the foot of the inner slope, protectedby a screen to exclude floating bodies, passes up the inner anddown the outer slope, discharging into a basin sufficientlyextensive to moderate the commotion of the water. It isadvisable to cover the pipe with puddled earth both on theinner and the outer slope, not only for protection against frost,. Fig. to prevent the influx of air through the joints. When thecrown of the reservoir is above the highest level of the waterno gate is necessary, the flow being established by the exhaus-tion of air and arrested by its admission. A gate or valve,however, is generally inserted for the purpose of regulating thequantity of water discharged. It is manifest that the height ofthe crown of the siphon above low water cannot exceed theheight due to atmospheric pressure, viz., about 34 feet. Prac-tically it is considerably less, and 25 feet is about as great alift as can be adopted. Fig. 86 * shows an outlet of this form * Description of the Bann Reservoir by Mallet in Weales Quarterly Paperson Engineering, vol. VI. part i. The figure is taken from Ilagens Wasserbau-kunst, Pi. LXXVI. THE WASTEWAY. 185 as applied to one of the Bann reservoirs near Dublin, success of this method requires efficient means constant!}-in readiness for exhausting the air from the summit of thesiphon
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthydraulicengineering
