Abstract: The present invention provides an overflow drain assembly for a sanitary vessel, wherein the vessel includes a bottom surface and at least one side surface depending therefrom, such that the surfaces together define a reservoir for receipt and storage of fluid thereby and at least one ledge is provided along at least a portion of at least one vessel side surface. The overflow drain assembly comprises a fastening plate having an envelope with a top surface and a bottom surface defining a generally planar body that lies proximate the vessel ledge, and a tarp portion depending curvilinearly therefrom. The tarp portion has a generally planar bottom surface disposed adjacent at least a portion of at least one vessel side surface so as to define a fluid egress therebetween for delivery of fluid from the vessel reservoir to a waste conduit in fluid communication therewith.