*Drainage and Wastewater Treatment* by V.S. Samoylov and V.S. Levadny is an essential resource for professionals in water supply and sanitation, as well as students and educators in environmental sciences and engineering. This edition delves deeply into the intricacies of drainage systems and wastewater treatment technologies, making it highly relevant amid today's environmental challenges. From the very first pages, readers are transported into a world where ecology and engineering intertwine, creating a unique atmosphere filled with scientific discoveries and practical solutions. The authors, drawing on extensive experience, share not only theoretical insights but also practical recommendations that can be applied in real-world scenarios. The book explores various drainage methods, including their design and operation, alongside modern wastewater treatment technologies—covering biological, physical, and chemical processes. It will appeal not only to professional engineers and environmentalists but also to students eager to understand how sanitation systems function. Ideal for those interested in sustainable development, environmental protection, and efficient water resource management, this book offers valuable ideas and guidance for addressing water pollution issues. Topics range from the impact of wastewater on ecosystems to innovative treatment methods that can significantly improve water resource management. The authors emphasize a comprehensive approach to solving drainage and treatment problems, making this work particularly relevant for specialists working in environmental conservation and sustainable development. Their clear and accessible writing style helps readers grasp complex technical concepts easily, often illustrated with practical examples, diagrams, and visual aids to clarify processes and technologies. V.S. Samoylov and V.S. Levadny are renowned experts in engineering and ecology, and their previous works further attest to their authority in the field. Their combined knowledge and insights make this book a valuable contribution to literature on drainage and wastewater treatment. Whether you're seeking detailed information on drainage systems, treatment technologies, or aiming to deepen your understanding of ecological and engineering principles, *Drainage and Wastewater Treatment* is the perfect resource. It will serve as a reliable guide in your professional and academic pursuits, opening new horizons in the effective management of water resources.