Protivofiltratcionnye device subsurface dam relates to the field of hydraulic engineering and can be used in the construction of such dams in the northern climate zone construction. The proposed device is a structure located along the longitudinal axis of the dam. Structure 1 comprises a diaphragm of the mastic asphalt and the transitional zone 2 of compacted concrete stacked height of the diaphragm 1 on both sides of it. The proposed utility model is aimed at increasing the reliability of the device impervious to harsh climatic conditions by eliminating the possibility of it unacceptable stresses and strains during thawing horse prism dam. Transition zones 2 impervious device, made of rolled concrete and arranged on either side of the bituminous diaphragm 1, firstly, the function of shuttering forming the diaphragm secondly - assume dangerous deformations arising during thawing promorozhennaya horse prism embankment dam.
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