This course surveys the principles of property law and administrative law regulating the acquisition and use of river water. It studies common law doctrines including riparian rights, prior appropriation, and the public trust and other judicial doctrines protecting public rights in water. The course studies statutory schemes regulating water use, focusing on administrative permit systems and different variations on those systems. It surveys environmental and other statutory programs that incidentally limit parties' use of water. It also studies a few case studies in which government agencies have used ad hoc processes to try to reach consensus-based solutions to conflicts over water use.