On Apr 4, 1:41*am, Andy wrote:
My mother's house is 55 yrs. old.

Her driveway has sunken and I am wondering why.

Maybe it is the water supply from the city ?

As in the void from the water supply ?

It could be that there is insufficient hard core under it for the
weight of traffic.
There may be a leaking water/drain has washed out the subsoil causing
the subsidance.
Or someone has driven a truck down the drive in the past.