Non-radiating pump cover

A dishwashing appliance defining a vertical direction, a lateral direction, and a transverse direction, the dishwasher appliance comprising:

• a tub positioned within a cabinet and defining a wash chamber;
• a door pivotally mounted to the cabinet to provide selective access to the wash chamber;
• a rack mounted within the wash chamber and configured for receipt of articles for cleaning;
• a plurality of spray assemblies;
• a primary supply conduit fluidly coupled to the plurality of spray assemblies;
• a pump assembly fluidly coupled to the primary supply conduit, the pump assembly comprising:
• a housing supporting an impeller for rotation within the housing;
• a motor coupled to the impeller to impart rotation;
• and
• a cover affixed to the housing, the cover comprising a generally planar panel having an inner surface and an outer surface, the generally planar panel defining one or more apertures formed through the inner surface and the outer surface;
• wherein the one or more apertures comprise between about 55% and about 75% of a surface area of the generally planar panel.