The management of transboundary watercourses poses enormous problems to the States that share them since the advent of the use of international watercourses for purposes other than navigation. This last aspect makes water the most used and coveted resource in the world, justifying both the value and rarity of this resource. The equitable use, protection, and non-conflictual sharing of international watercourses have always been subject to regulation based on a number of theoretical and conventional principles that vary from one context to another. These Doctrines and theories and principles enshrined in several international agreements, including the United Nations Convention on the Law of the Non-Navigational Uses of International Watercourses are currently constituting the modern rules governing the management of shared watercourses. This article aims to make a deep study of doctrines and theorical rules as well as conventional principles currently govern the management of international watercourses. in this purpose, the principles consecrated in the 1997 New York framework Convention adopted on 21 May and entered into force in 2014, will be deeply analyzed.
