a hood for mounting over an outlet in a wall of a catch basin is disclosed . the hood includes a hood wall that forms a prow in a horizontal plane . the prow extends along an axis of the hood thereby achieving optimal flow conditions in the catch basin . in some embodiments the hood wall is shaped to be at least partially sealably mounted to the interior wall of a catch basin have a circular cross section in a horizontal plane . this novel hood shape facilitates installation of the hood in the circular catch basin , while also reducing the flow of oil and other pollutants into the outlet pipe in the circular catch basin . in some embodiments a perforated screed is also disclosed that surrounds the hood to aid in the capture of floatable pollutants .