Abstract
The article discusses technological solutions for the renovation (reprofiling) of the outer layer of surface overflows, taking into account the size and shape of the Porąbka Dam. The history of its creation, the legitimacy of construction and basic construction parameters are presented. The issues of damage and destruction of concrete in damming structures of this type, technological aspects of the permanent connection of old and new concrete, the essence of shotcrete technology (shotcrete) and the results of durability and strength tests of selected building materials were discussed.