Continuing trespass

The bill shows a continuing trespass of such nature and of such character of injury that remedies at law by actions for damages would be inadequate, and would, besides, entail repeated litigation. ... A plaintiff's right of suit cannot be defeated by a mere supposition that he or she may be successful, or that the defendant may cease to offend against the right asserted. It is in the hope of one or the other of such results that the suit is brought against a present or threatened violation of rights. If wrongs are endured in the meantime, there is no loss of rights or remedies.

One which does not consist of a single isolated act but is in its nature a permanent invasion of the rights of another; as, where a person builds on his own land so that a part of the building overhangs his neighbor's land.

Defined under Trespass in Black's Law Dictionary.