Abstract: A retractable cover unit for a hot water distribution basin of a cooling tower includes a frame secured to the basin and a flaccid cover. The frame includes opposed framing members overlying the opposed side walls of the basin, and a pair of connectors are secured between the framing members and spaced laterally from one another. A plurality of grommets are presented along the lateral sides of the cover through which the connectors are threaded. The end edges of the cover are attached to the framing members for holding the cover over the basin, while structure is provided for detaching at least one of the end edges of the cover to permit the cover to be moved along the connectors allowing access to the basin.