This document summarizes Philippine laws related to water rights and management. It discusses various types of easements relating to water under civil code, including natural drainage and construction of dams. It also outlines obligations of lower estates to receive natural water flow from higher estates. The document then covers declarations of navigable rivers, watershed protections, and powers of the National Water Resources Board to regulate water use and resolve disputes. It concludes by discussing water districts, penalties for violations, and roles of the Local Water Utilities Administration.