Concrete underground catchment and termites

[StillHope]

Thanks,Rob and JWITZ!
When I used the term underground,I should have been more specific.My goal is to save the space.And I don't like swimming pool-like tanks on a small lot.
Rob,I like the idea of the materials we talked about.And if all it takes to use them in my project was my "ruling",I wouldn't use anything else.
But sometimes life rules..Changing the plans and changing the floor plans unfortunally means the same.

Anyway,hopefully,I will get the risk assessment of the well project,but the catchment under the house is something to consider.
So anyone has those "hidden catchments"?
Any cons/pros?