EE WAS ALIGNING 2 PIECES OF FLANGED PIPE WHICH WERE FLOATING ON PONTOONS ON THE DREDGE POND. THEY WERE USING AN OUTBOARD BOAT TO LINE UP THE PIPE BECAUSE OF HIGH WIND. INJURED WAS ON THE PIPEL INE. THE BOAT WAS AT HIGH THROTTLE TO COMPENSATEFOR THE WIND.INJURED STEPPED ONTO THE BOAT & THEFRONT OF BOAT SLIPPED UNDER PIPELINE. THE BOAT SHOT FORWARD CATCHING LEG BETWEEN BOAT & PIPELIN