Drawing on authors from both riparian and prior appropriation jurisdictions, the new edition incorporates dozens of recent judicial decisions and important statutory developments. Nearly every principal case featured in the leading casebooks is cited or discussed, making the book a valuable resource for students, practitioners, and judges alike. The revised edition also addresses emerging and evolving issues, including climate disruption, conflicts between groundwater and surface water, public recreational uses, instream flow protection, federal water development, takings claims, and questions of water access and equity.