The book "Design of internal water supply and sewerage of buildings for various purposes" by Zakharov is an indispensable source of knowledge for all who are interested in the design of engineering systems. It details key aspects of the design of plumbing and sewer systems, making it relevant to both students and practitioners in the construction and architecture fields. The author, with many years of experience in design and construction, shares his knowledge and practical recommendations that will help readers avoid common mistakes and optimize design processes. The book covers a wide range of topics from the basics of design to more complex issues related to the calculations and choice of equipment. Zakharov pays attention not only to technical aspects, but also to the environment, which makes the book especially valuable in the light of modern requirements for sustainable development and environmental protection. This book will be of interest not only to engineers and architects, but also to students of technical universities, as well as to anyone who plans to design or repair buildings. It will be an excellent tool for those who want to understand more deeply how internal water and sewage systems function, and how to design them correctly taking into account all modern standards and norms. The topics raised in the book range from the selection of materials and equipment to design features in different climatic conditions.[citation needed] Zakharov focuses on the importance of compliance with norms and rules, which makes his work especially relevant for specialists working in conditions of strict regulation. Readers will be able to learn about new technologies and techniques that will help improve design efficiency and reduce costs. The author's style is distinguished by clarity and accessibility of presentation, which makes it easy to assimilate even the most complex topics. Zakharov uses many examples from practice, which makes the material more clear and understandable. His previous work is also noteworthy, as it covers related topics and helps to create a holistic view of engineering systems design. Readers familiar with his other books will appreciate the consistency and depth of the analysis he offers. The book "Design of internal water supply and sewerage of buildings for various purposes" is not just a textbook, but a whole reference book that will become a reliable assistant in the work. It will help readers to understand the complex design issues and will give the opportunity to confidently apply the knowledge gained in practice. If you are looking for a literature on engineering systems design that combines theory and practice, then this edition will be an excellent choice. Do not miss the chance to enrich your knowledge and skills by reading this fascinating and useful book.