Between the wall and the 6-inch board tamp in sufficient gravel to even
off all irregularities in the ground surface and to allow the building
of a 5-inch thickness of floor, sloping ½ inch from the wall toward the
gutter. Mix the concrete 1: 2½: 5, tamp into place, and finish the
surface with a wooden float and a wire brush. The roughened surface
thus produced gives the cows a good footing.