Patent ID: 7527453

Claim:
A buoyant body, comprising: an exterior envelope defining a hollow watertight chamber said envelope comprising a plurality of intersecting planar and cylindrical surfaces forming walls having ribbed outer surfaces, a plurality of said planar and cylindrical surfaces having a plurality of at least one of protrusions, ridges, grooves and channels formed on said planar surfaces and said cylindrical surfaces, said plurality of intersecting planar and cylindrical surfaces sized and shaped to receive flowing water and direct the water in a direction different from the direction in which the water is received, means enabling attachment to other buoyant bodies, said envelope including a first part and a second part, the first and second parts being symmetrical and arranged for engagement to each other to provide a complete body, wherein said first and second parts include complementary opposing internal wall surfaces having engageable mating extensions and grooves for securing parts together to form a single body.