This lecture covers the principles of urban water drainage, focusing on the management and planning of water in urban areas. Topics include the impact of urbanization on water tables, flood management, and the design of drainage systems to reduce negative effects on the environment. The instructor discusses the importance of anticipating future needs, reducing flood risks, and implementing innovative solutions to counteract the effects of urbanization. Additionally, the lecture explores the use of controlled overflows in urban and agricultural areas, as well as the challenges of water quality and wastewater management.