Hatfield
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See the river is described as fast-flowing.
Someone (i dont remember who) replied to a question about the river with, "Its shallow and slow flowing" I did think, on comparison to what, The Humber? I wouldnt personally describe it as shallow or slow flowing overall. I suppose its partly down to perception.
One thing that could explain why there were not more witness sightings of a body floating on top in the river is because the body could have been close to achieving "Neutral Buoyancy" which means it would be submerged and floating with the current but not necessarily all the way on top or all the way on bottom either.
Similar if anyone has ever seen a heavy water-logged log floating down the river. If you barely push down on the water-logged log it will easily go down about 2 or 3 feet deep before eventually making its way back to the top. The log is close to achieving perfect neutral buoyancy.
Most of us know that depending on the water temperature when a person first dies and is placed in water and so long as all the air is out of the lungs, then it will sink for a period of time (Negative Buoyancy) and could even move with the current along the bottom and not be seen by people on shore.
And as a body goes through decomposition and gasses increase in the body, it will have a tendency to rise up (Positive Buoyancy) and can float to the top if the temperature is warm enough to facilitate decomposition.
However there is also a period of time where a body will achieve (Neutral Bouyancy) where it can be floating within the depths and not be on bottom or on top and still be moving along with the current.
So there could have been a period of time where the body moved down the river at some X number of feet below the surface and nobody on the shore would have seen it moving down the river.
Below is a link to the 3 types of buoyancy.
Three Types of Buoyancy
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