I bought a house two years ago built in 1951, and I'm regarding all four sides. The house sits on a slope. The gutters at the 4 corners drop into 6-inch round clay tile pipes and run deep along the foundation before exiting at the far edge of the property. This looks like it must have been built this way when the house was new.

I'm trying to figure out if these drain tiles only carry the gutter/roof water, or whether they are also footer drains running along the foundation. The reason I want to know is that I could, without too much trouble right now, divert the gutter runoff another direction, so as not to potentially add the roof water to the foundation, if the tiles are in fact open along there.

Does anyone know if this was a common thing to do in 1951?