What is Permanent Nuisance?

Legal Definition
this is the term applied to a nuisance that cannot be removed and damage that will continue indefinitely.
Legal Definition
One of such character and existing under such circumstances that it will be presumed to continue indefinitely. See 75 Neb. 838, 5 L. R. A. (N. S.) 486, 106 N. W. 996.
-- Ballentine's Law Dictionary