An overflow system for casting a component is disclosed. The system includes a mold formed of sand. The mold includes a top surface that defines an opening for receiving a liquid fluid. A trenching assembly includes a cutting device movable relative to a frame between a first position and a second position. The cutting device includes a cutter that is in a disengaged position spaced from the top surface when the cutting device is in the first position and in an engaged position engaging the top surface when the cutting device is in the second position. The cutter defines a recess in the top surface when the cutter is in the engaged position. The recess is spaced from the opening for receiving excess liquid fluid. The trenching assembly further includes at least one of a blocking mechanism, a blowing mechanism and an adjustment mechanism that assists the cutting device.