Channel system inserted into a floor of a structure for the collection of a liquid, comprising - at least two opposite elongated support profiles, which together between themselves delimit a channel space and respectively delimit at least part of the floor laterally from the channel space, - at least one U-shaped channel body, which extends between the support profiles such that it bridges the channel space, wherein a longitudinal axis of the channel body is oriented parallel to longitudinal axes of the support profiles, and - at least one drain fluidically connected to the channel body by means of which water collected in the channel body can be drained from the channel body, wherein the channel body has two lateral flanges, one of which respectively extends from one of the two upper ends of the remaining channel body and is associated with one of the support profiles, wherein the flanges are pressed against an assigned upper end face of the respectively associated support profile by means of at least one pressure profile in such a way that the respective flange and the associated support profile are in sealing contact with one another, wherein the channel system is provided with a channel cover, wherein the channel cover bridges the channel space in such a manner that vertical loads acting in one area of the channel space can be transferred to the sides of the channel space, characterized by at least two elongated sealing elements, which extend parallel to the support profiles, wherein respectively one of the sealing elements is associated with one of the support profiles wherein respectively one sealing element is in direct sealing contact with the upper end face of the respectively associated support profile and wherein the sealing elements are respectively guided to a side of the support profiles facing away from the channel body such that the channel system can be connected to a sealing system of the structure on its two sides respectively facing away from the channel body by means of the sealing elements. - at least two opposite elongated support profiles, which together between themselves delimit a channel space and respectively delimit at least part of the floor laterally from the channel space, - at least one U-shaped channel body, which extends between the support profiles such that it bridges the channel space, wherein a longitudinal axis of the channel body is oriented parallel to longitudinal axes of the support profiles, and - at least one drain fluidically connected to the channel body by means of which water collected in the channel body can be drained from the channel body, wherein the channel body has two lateral flanges, one of which respectively extends from one of the two upper ends of the remaining channel body and is associated with one of the support profiles, wherein the flanges are pressed against an assigned upper end face of the respectively associated support profile by means of at least one pressure profile in such a way that the respective flange and the associated support profile are in sealing contact with one another, wherein the channel system is provided with a channel cover, wherein the channel cover bridges the channel space in such a manner that vertical loads acting in one area of the channel space can be transferred to the sides of the channel space, characterized by at least two elongated sealing elements, which extend parallel to the support profiles, wherein respectively one of the sealing elements is associated with one of the support profiles wherein respectively one sealing element is in direct sealing contact with the upper end face of the respectively associated support profile and wherein the sealing elements are respectively guided to a side of the support profiles facing away from the channel body such that the channel system can be connected to a sealing system of the structure on its two sides respectively facing away from the channel body by means of the sealing elements.