Inter-State Water Law in the United States of America: What Lessons for International Water Law? By Rhett B. Larson, Brill Research Perspectives in International Water Law, Volume 2, Issue 3, pages 1 – 82, 2017

This monograph analyzes the three general approaches to water allocation between riparian states to certain shared watercourses in the United States, namely equitable apportionment, congressional apportionment, and inter-state compacts. This analysis is accompanied by a discussion and evaluation of the different cases of shared watercourses that applied these approaches, and a comparison of each of them to similar approaches in international water law. The monograph draws lessons for international water law from inter-state water law—highlighting the successful inter-state approaches that can be adopted by international water law, as well as the approaches that failed, and which should be avoided. The monograph may be purchased online, at