Quote:
Originally Posted by adc100
There is a gravel base under the concrete. It probably just goes to the gravel under the entire concrete floor.
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Water is every homes enemy. Draining water under a slab of concrete is really not a good idea, it does many strange and damaging things. Are you sure that it is not some sort of catch basin that is filled with gravel, and drains elsewhere? I would be very leary of it if it is just draining willy nilly under the slab.