Abstract: A plurality of individual modules including individual support platforms for cylindrical hollow core risers are installed in side-by-side interlocked relationship to construct a semi-permeable barrier that is oriented in load distributing relationship approximately parallel to the shoreline. This semi-permeable barrier forms a hollow core and high profile breakwater that is intended to dissipate the energy of incoming waves before they reach the shoreline. Gaps between modules, and between high profile sections of the breakwater allow free flow of water between the landward and seaward sides of the barrier to prevent elevated water levels behind the barrier. An upper riser section of each module is partially submerged at high tide and emerged at low tide. The seaward facing lower section of the module has an inclined ramp that absorbs reflected wave energy and inhibits toe scour. Precast wafers of concrete can be added or removed from the modules as required for ballast.