At the time of [problem] large typhoons and torrential rain, even if it occurs overflow phenomenon to break into the land side of the water beyond the top of the embankment, depth occur at the bottom and around the slopes of the embankment delaying the progress of the dig, to provide a revetment for the foundation block to ensure that extend the time until the embankment to collapse A installed at the bottom of a number of revetment blocks pile up along the slope of the embankment a seawall for the basic block 1 which supports the revetment block, front 1a, a rear surface 1b, the top surface 1c, the lower surface 1d, the left and right side 1e, as well as to the long rectangular shape a whole to the left and right have 1f, the upper side of the rear surface 1b to block receiving portion 11 revetment block strikes, a recess 12 is provided in the block receiving portion 11, recess 12 connecting hook of the revetment block is provided with a connecting hook 13 to be connected via a connecting fitting inFIELD 4
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