Illustrated here: The effect of expansion of wood under water.
From the NFPA Quarterly v.7, no.1:
"At the time of a recent flood in Dayton [Ohio], a quantity of oak dashes veneered with maple were stacked to within about one inch of a reinforced concrete girder in the basement of the Maxwell Motor Car Company's reinforced concrete factory. This girder was 12 x 19 x 24 inches and supported a six-inch reinforced concrete floor.
The accompanying photograph illustrates the enormous power exerted by the expansion of the wood under water. The girder was lifted three inches, together with the concrete floor which it supported. At the time [the picture was taken], ten weeks after the flood, the girder still rests on the dashes, but it has settled about three fourths of an inch. It will no doubt be necessary to make a complete replacement of affected girder and floor."
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