"Hydrological variability, increasing competition for water, and the need for regulatory flexibility may increasingly compel governments to adopt measures with significant economic impact on foreign investment. [In this book, the author], offers an appraisal of indirect expropriation, revisiting the well-known doctrine of the police power. Through the lens of international investment law, the author explores a framework that assesses the legitimate exercise of police power with particular attention to the special nature of water resources."