Retaining wall and section thereof

Claim 1

A PRECAST REINFORCED STRUCTURALLY INTEGRAL CONCRETE RETAINING WALL SECTION HAVING A LENGTH ADJACENT THAT OF ITS HEIGHT WITH ITS SIDE EDGES SHAPED TO PROVIDE A TONGUE ON ONE SIDE EDGE AND A GROOVE ON AN OPPOSITE SIDE EDGE ENGAGEMENT WITH A CONTIGUOUS WALL SECTION ON EACH SIDE, AND PROVIDED ON ITS REAR SIDE WITH A STRUCTURALLY INTEGRAL REINFORCED CONCRETE HEEL AND BUTTRESS, SAID BUTTRESS BEING ATTACHED TO A CENTRAL PORTION OF SAID HEEL AND SAID HEEL BEING OF A LENGTH LONGITUDINALLY OF SAID WALL AND SHORE LINE AND OF ABOUT HALF THAT OF SAID SECTION, SAID BUTTRESS BEING IN SUBSTANTIALLY A LONGITUDINAL CENTER OF SAID SECTION AND OF SAID HEEL, SAID HEEL BEING OF AN AREA TO BALANCE THE THRUST DUE TO STATIC PRESSURE HEAD OF HIGH TIDE AND ALSO OF AN AREA TO RETAIN THE WALL IN ITS POSITION AGAINST THE PRESSURE OF LAND FILL ON THE REAR SIDE OF SAID SECTION WHEN SAID HEEL IS ADJACENT THE LOW TIDE LEVEL BUT SPACED ABOVE A BOTTOM EDGE OF SAID SECTION, SAID BOTTOM EDGE BEING OF SUBSTANTIALLY THE SIZE OF A HORIZONTAL CROSS SECTION OF SAID SECTION EXCLUSIVE OF THE HEEL AND BUTTRESS, SAID HEEL BEING PROVIDED WITH A PERFORATION ADJACENT SAID BUTTRESS AND WALL ON EACH SIDE OF SAID