FIELD: hydraulic engineering.;SUBSTANCE: invention relates to hydraulic engineering, namely to hydraulic systems with ground dams and spillways. The essence of the invention is the creation of a more economical filter spillway on a ground dam with a shield. On a ground dam, which includes a body of water-permeable material (stone, pebbles, crushed stone) and an anti-filtration shield, hollow reinforced concrete boxes without a bottom are placed behind the shield at a level of the calculated water level WL in a reservoir, vertical walls of which, facing upstream, are not solid, but have holes - slots with a total area of at least 40% of the total wall area, and from above, boxes are covered with a reinforced concrete slab with a parapet, which serves as a dam crest and has a mark of the maximum water level WL. These walls with slots are a water intake of the filter spillway. Hollow reinforced concrete boxes are installed on the section of the filter spillway, and on remaining sections of the dam, the anti-filtration shield is raised along a slope to the maximum water level mark, and a parapet with a height of up to the crest of the ground dam is placed on it. On a dam base, within the lower part of the lower slope, in the area of the filtration flow outlet into the downstream, a stone prism is poured out of the rock mass, the top of which is higher than the calculated water level in the downstream, when the maximum flood is passed, and the slope of the lower slope of the prism and the size of the stone are selected in such a way that to ensure a safe outlet of the filtration flow into the downstream. ;EFFECT: safe passage of flood flow by passing water through the filter spillway, reducing the volume of reinforced concrete structures and construction and installation works, and reducing the cost of the dam as a whole.;3 cl, 1 dwg
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