Patent ID: 7250004

Claim:
A ski run with a skiing surface provided with snow, said ski run having a layered structure located below the skiing surface, said layered structure being provided with a means for preserving snow of the skiing surface, said means for said system for preserving snow comprising: at least cooling pipes suitable for the flow of a cooling agent for cooling the snow present on the skiing surface, whereby the cooling pipes for the flow of a cooling agent are embedded and located in a first layer of the layered structure, said first layer being adapted for ensuring a water percolation through said first layer when said first layer has a temperature of at least 2° C., and wherein below the first layer in which the cooling pipes are embedded, a draining porous layer extends, below the first layer, for collecting and draining at least substantially all the water percolating through the first layer, wherein said draining porous layer has a thickness greater than 5 cm and comprises particles, a large proportion of said particles having a size greater than 0.5 cm.