Opinion of the Commission Pursuant to Article 251 (2) (c) of the EC Treaty, on the European Parliament's Amendments to the Council's Common Position Regarding the Proposal for a European Parliament and Council Directive Establishing a Framework for Community Action in the Field of Water Policy (COM (97) 49 Final, COM (97) 614 Final, COM (98) 76 Final and COM (99) 271 Final) - Amending the Proposal of the Commission Pursuant to Article 250 (2) of the EC Treaty