Subject to the provisions of this Chapter and of Chapter IV, a person shall acquire a servitude by prescription if he has openly and as though he were entitled to do so, exercised the rights and powers which a person who has a right to such servitude is entitled to exercise, for an uninterrupted period of thirty years or, in the case of a praedial servitude, for a period which, together with any periods for which such rights and powers were so exercised by his predecessors in title, constitutes an uninterrupted period of thirty years.