Case C-461/13: Judgment of the Court (Grand Chamber) of 1 July 2015 (request for a preliminary ruling from the Bundesverwaltungsgericht — Germany) — Bund für Umwelt und Naturschutz Deutschland e.V. v Bundesrepublik Deutschland (Reference for a preliminary ruling — Environment — EU action in the field of water policy — Directive 2000/60/EC — Article 4(1) — Environmental objectives relating to surface waters — Deterioration of the status of a body of surface water — Project for the development of a navigable waterway — Obligation of the Member States not to authorise a project that may cause a deterioration of the status of a body of surface water — Decisive criteria for determining whether there is a deterioration of the status of a body of water)