Arbitration — Jurisdiction — Dispute between the Netherlands and France — Dispute concerning financing of operations contemplated by 1991 Additional Protocol to Convention on the Protection of the Rhine against Pollution by Chlorides, 1976 — Auditing of accounts — Dispute relating to calculation of amount France to repay the Netherlands — The Netherlands proposing calculation based on 61.5 French francs per ton of chlorides stored — France proposing calculation based on actual costs per unit — Annex III to Protocol concerning financial arrangements — Point 4.2.1 of Annex III to Protocol — Method of calculation — Submission of dispute to Arbitral Tribunal pursuant to Article 13 of Convention and Article 7 of Protocol — Article 13 of Convention — Annex B to Convention concerning arbitration

Rivers — Rhine — Environmental standards — Convention on the Protection of the Rhine against Pollution by Chlorides, 1976 — Distribution of costs between France and the Netherlands — Auditing of accounts

Treaties — Interpretation — Application — 1991 Additional Protocol to Convention on the Protection of the Rhine against Pollution by Chlorides, 1976 — Annex III to Protocol on financial arrangements — Auditing of accounts — Interpretation of point 4.2.1 of Annex III to Protocol — Interpretation of treaties in accordance with international law — Vienna Convention on the Law of Treaties, 1969 — Whether Articles 31 and 32 of Vienna Convention applicable — Whether codifying customary law — Whether general rule of interpretation in Article 31 forming integral whole — Basis for treaty interpretation — Relative importance of constituent elements of rule — Role of good faith — Relationship between Articles 31 and 32 — Subsequent practice of the Parties — Context of point 4.2.1 — Article 4 of Protocol — 1991 Declaration of the Heads of the Delegation — Object and purpose of Protocol — Relevant rules of international law — Supplementary means of interpretation — Point 4.2.1 of Annex III to Protocol providing for final auditing of accounts — Method of calculation — Reimbursement sum France obliged to pay the Netherlands