. Electric traction and transmission engineering . e sufficiencly long to allow escape of the waterin times of heavy flood without undue rise in level of thewater in the reservoir above the dam. It is essential thatthe dam have a solid foundation, that it be stable againstoverturning and be water-tight, and that it be so con-structed as to prevent washing out of the river bed andbanks below it and erosion of the dam itself. Dams maybe constructed of timber, masonry, or reenforced must be equipped with drain or sluice gates for thepurpose of draining the reservoir above them as we
. Electric traction and transmission engineering . e sufficiencly long to allow escape of the waterin times of heavy flood without undue rise in level of thewater in the reservoir above the dam. It is essential thatthe dam have a solid foundation, that it be stable againstoverturning and be water-tight, and that it be so con-structed as to prevent washing out of the river bed andbanks below it and erosion of the dam itself. Dams maybe constructed of timber, masonry, or reenforced must be equipped with drain or sluice gates for thepurpose of draining the reservoir above them as well as forassisting in the discharge of water during the heaviestfloods. The surface of the reservoir may be raised at HYDRAULIC STATIONS. 289 times by means oiflashboards, which collapse automaticallyupon excessive rise of water. A plan of a typical low-head hydraulic development isillustrated in Fig. 120, which shows the Johnsonville de-velopment of the Schenectady Power Company. This damcauses the flooding of 850 acres, thereby giving a storage. DEFLECTING WALL
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