> Add to the fact that most matural cavities are by thier formation 
> watar traps and its a confusing picture

I am not sure what this means. Anyway, no two tree cavities, nor caves, nor holes in the ground -- are alike. So to use a "natural hive" as a model is a bit daft. 

??  Really simple really,  natural tree cavities are formed from dead rotting branches and forks.  Most cavities are formed when a branch breaks or some other injury allows water to pool in the tree tissue.

As such most cavities are already places where water was collecting.    Not all of course but the vast majority of them here in the Midwest.


Charles

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