Abstract
States sharing freshwater resources have developed basic rules governing the use of these resources through their practice over many years. Some of the rules form part of customary international law, which is a body of unwritten law binding on all states. Countries sharing freshwater may also enter into treaties applying and adjusting rules of customary law to suit their specific situations with regard to the watercourses they share.' In contemporary state and institutional practice of none state actors, two doctrines have attained supremacy. The first entitles riparian states to exploit international watercourses in an equitable and reasonable manner. The second principle cautions states to take appropriate measures in the utilization of trans-boundary Rivers such that significant harm to the share of other watercourse states is averted. Today these two principles are indisputably regarded as cornerstones of the regime of international watercourses law. This note tries to look in to the duty not to cause significant harm and its interplay with the equitable and reasonable utilizations rule. The presentation will also explore lingering issues of preeminence between the two principles which may be crucial in understanding the full scope of riparian rights and obligations in the international water basin.
Published Version
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