Jennifer Blyth

Many variables control the movement of logs floating in rivers. It is never constant; it is dependent upon the river, currents, climate, wind, and blockages. Orientation of the logs in the water depends on water flow. Singular logs are fast-moving and can easily be turned by the changes in the currents; however, the pull of gravity in the open water also causes the logs to come together and collide. Water is strongly cohesive. The molecules make hydrogen bonds to others, causing a strong polar bond between wet logs. This allows free-floating logs to continually align. As more logs attract, they begin to build upon each other to create a slower-moving mass. The larger the mass, the greater the attraction of other logs to that mass. The large mass of logs is stronger and
less likely to break apart by current alone. Only a blockage could break the bonds between the logs. The river acts as a boundary to the floating logs, and the depth of the banks controls the likelihood of dams forming.

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