1. Annexes I, III and section 1.3.6 of Annex V may be adapted to scientific and technical progress taking account of the periods for review and updating of the river basin management plans as referred to in Article 13. Those measures, designed to amend non-essential elements of this Directive, shall be adopted in accordance with the regulatory procedure with scrutiny referred to in Article 21(3).
Where necessary, the Commission may adopt guidelines on the implementation of Annexes II and V in accordance with the regulatory procedure referred to in Article 21(2).
2. For the purpose of transmission and processing of data, including statistical and cartographic data, technical formats for the purpose of paragraph 1 may be adopted in accordance with the regulatory procedure referred to in Article 21(2).]