Civil Code (Cap. 16), article 378

378. Usufruct terminates - (a) by the death of the usufructuary; (b) by the expiration of the time for which it was constituted; (c) by the merger or reunion in one and the same person of the two capacities of usufructuary and owner; (d) by non-user of the right during thirty years; (e) by the total loss of the subject of the usufruct. Termination of usufruct by wrongful use thereof.