Abstract: A irrigation pump apparatus includes an elongated frame having a proximate end portion and a distal end portion. An elongated drive shaft extends along the frame and to the proximal and distal end portions. The drive shaft is adapted to be driven by a piece of farm machinery, such as a tractor having a power take off connectable to the drive shaft. A pump housing mounted at the distal end portion of the frame carries an impeller that rotates with the drive shaft during use. The pump housing has an impeller that provides an improved configuration with enhanced efficiency. The housing includes a baffle portion supported within the housing and adjacent the discharge outlet and having an upper end portion positioned adjacent a transversely side wall portion of the housing. The baffle forms an acute angle of about forty degrees to eighty degrees (40.degree.-80.degree. ) with the adjacent transversely extending side wall portion of the housing and is generally perpendicular to the opposite portion of the housing.