. Bulletin of the Department of Agriculture. Agriculture; Agriculture. SPILLWAYS FOR RESERVOIRS AND CANALS. 31 the effects of this departure and verify or correct the theory of the parting water column in siphons under relatively high heads would be of benefit, and the tests taken on the Yuma installation, where the design is identical except for the converg- ing outlet, could be con- trasted. As a method of auto- matically safeguarding the freeboard of a canal at isolated points, the small siphon shown in figure 2, Plate XI, and in text-figure 11 is a good example. These figures illustra
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. SPILLWAYS FOR RESERVOIRS AND CANALS. 31 the effects of this departure and verify or correct the theory of the parting water column in siphons under relatively high heads would be of benefit, and the tests taken on the Yuma installation, where the design is identical except for the converg- ing outlet, could be con- trasted. As a method of auto- matically safeguarding the freeboard of a canal at isolated points, the small siphon shown in figure 2, Plate XI, and in text-figure 11 is a good example. These figures illustrate the siphon at the head of the East Park Feed Canal of the Orland project. It is designed to operate when the water stands foot'above the top of the waste weir at the place of diversion, and thus fur- nish a close regulation of the water sur- face. The estimated capacity is 99 sec- ond-feet, with taken as the discharge coefficient. This was one of the first in- stallations in the United States and followed the European custom of inclined draft tube, the slope of the ground at the site being particularly adapted to the design. EUROPEAN PRACTICE. The Italian engineer Luigi Luiggi describes numerous siphon spillways which have applied to dams and to many power and irrigation prevailing type is a square tube built of reinforced con- crete and capable of discharging from 1 to 525 second- feet, varying, of course, according to section and the head under which they operate, which ranges up to 34 feet. To produce larger discharges where head was limited, siphons are placed in batteries. A typical example of clever control by the siphon spillway is shown in the case of the Logalunga Reservoir, near Genoa,. 1 Transactions of the International Engineering Congress, 1915, Waterways and Irriga- tion Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illu
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