Abstract: A volumetric measurement vessel is characterized by a bottom wall having an inverted saddle shape defining a concave trough at its topside, and mounted in a tilted orientation placing the trough at an obliquely inclined angle. An outlet of the vessel is positioned at a lower end of the trough at an angle matching the tilted bottom wall to provide smooth, vortex free draining of the tank body at the outer periphery thereof. The bottom wall is cut as a flat piece of squashed oval shape, and subsequently bent into curved form to create the trough. A circumferential wall of the vessel is cut as a flat piece with a wave-shaped bottom edge, then bent into circular form to align major and minor troughs of the wave shape with opposite ends of the bottom wall's concave trough.

Abstract: A volumetric measurement vessel features a tank body including top, bottom and circumferential walls enclosing an interior space, and a neck standing upwardly from the tank body in fluid communication with the interior space. A gauge is operably associated with the neck to indicate a volumetric measure of liquid content contained within the vessel, and an outlet is positioned proximate an intersection of the bottom and circumferential walls of the tank body for draining of said liquid content from the vessel. The bottom wall has an inverted saddle shape defining a concave trough at its topside, and is mounted in a tilted orientation placing the trough at an obliquely inclined angle relative to the upright axis. The outlet is positioned at a lower end of the trough at an angle matching the tilted bottom wall to provide smooth, vortex free draining of the tank body at the outer periphery thereof.