Abstract: A device for restricting the flow through a curb inlet opening of a street storm drain by positioning a face plate thereover with a plurality of flow apertures therethrough of limited size. The face plate is securable to the drain by a mounting apparatus including one or more mounting brackets along with an engagement device for securing the mounting brackets with respect to the drain and the face plate for mounting the face plate extending over the curb inlet opening. Mounting brackets include alternatively teeth for engaging mated teeth on the rear of the face plate and storm drain engaging teeth also. Edges of the face plate can be chamfered for protection and a protective rim can extend upwardly around the securement apertures for protection thereof.