A gutter for an evaporative panel of a cooling system, comprising at least one channel element comprising a bottom wall and a pair of opposing side walls extending from the bottom wall and ending at the respective top edges of the channel element, and at least one joint configured to sealingly connect one end of the channel element to another component of the evaporative panel, the joint comprising - - an outer part configured to be coupled to an outer surface of the channel element and provided with a pair of flanges suitable to be arranged at the respective top edges of the channel element, - - an inner part configured to be coupled to an inner surface of the channel element and provided with a pair of flanges suitable to be arranged at the respective top edges of the channel element, - at least one gasket suitable to be interposed between the inner part of the joint and the inner surface of the channel element, and - clamping means acting on the flanges (35c, 31c) to clamp the end of the channel element between the inner part and outer part of the joint, wherein the outer part of the joint has a seat in the shape of a saddle, suitable to receive the end of the channel element, and the inner part of the joint comprises a corresponding bottom portion and a pair of opposing side portions extending from the bottom portion, wherein in the seat of the outer part of the joint a partition is made, extending transversely inwards, said partition defining a reference position for the end of the channel element, said gutter being characterized in that on the inner part of the joint a plurality of bridge portions (37a, 37b) are made, extending between the side portions of the inner part, wherein said bridge portions comprise a bridge portion and an upper bridge portion, said upper bridge portion being made as a grid and serving as a support for a panel element of the evaporative panel. at least one channel element comprising a bottom wall and a pair of opposing side walls extending from the bottom wall and ending at the respective top edges of the channel element, and at least one joint configured to sealingly connect one end of the channel element to another component of the evaporative panel, the joint comprising - - an outer part configured to be coupled to an outer surface of the channel element and provided with a pair of flanges suitable to be arranged at the respective top edges of the channel element, - - an inner part configured to be coupled to an inner surface of the channel element and provided with a pair of flanges suitable to be arranged at the respective top edges of the channel element, - at least one gasket suitable to be interposed between the inner part of the joint and the inner surface of the channel element, and - clamping means acting on the flanges (35c, 31c) to clamp the end of the channel element between the inner part and outer part of the joint, - - an outer part configured to be coupled to an outer surface of the channel element and provided with a pair of flanges suitable to be arranged at the respective top edges of the channel element, - - an inner part configured to be coupled to an inner surface of the channel element and provided with a pair of flanges suitable to be arranged at the respective top edges of the channel element, - at least one gasket suitable to be interposed between the inner part of the joint and the inner surface of the channel element, and - clamping means acting on the flanges (35c, 31c) to clamp the end of the channel element between the inner part and outer part of the joint, wherein the outer part of the joint has a seat in the shape of a saddle, suitable to receive the end of the channel element, and the inner part of the joint comprises a corresponding bottom portion and a pair of opposing side portions extending from the bottom portion, wherein in the seat of the outer part of the joint a partition is made, extending transversely inwards, said partition defining a reference position for the end of the channel element, said gutter being characterized in that on the inner part of the joint a plurality of bridge portions (37a, 37b) are made, extending between the side portions of the inner part, wherein said bridge portions comprise a bridge portion and an upper bridge portion, said upper bridge portion being made as a grid and serving as a support for a panel element of the evaporative panel.