The book "Underground contour of hydraulic structures (design of underground parts of dams on a non-rocky base)", created by the team of authors, is a unique and important work in the field of hydraulic engineering and engineering design. This edition will be especially interesting for specialists working in the field of construction, design and operation of hydraulic facilities, as well as students and teachers of specialized universities. This work examines the key aspects of the design of underground parts of dams, making it an indispensable tool for engineers and architects engaged in the creation and modernization of hydraulic structures. The book covers a wide range of topics, ranging from geological and hydrological conditions affecting design to modern methods of analysis and assessment of the stability of underground structures. The authors share their knowledge and experience, which allows the reader to better understand the complex processes occurring in the bowels of the earth and their impact on the durability and safety of hydraulic facilities. One of the key topics raised in the book is the importance of taking into account the specifics of bearing bases when designing underground parts of dams. The authors explain in detail how different types of soils and their physical and mechanical properties can influence the choice of materials and construction technologies. This knowledge is especially relevant for engineers working in regions with unstable geological conditions, where design errors can lead to serious consequences. The book also addresses the issues of sustainability and reliability of hydraulic structures, which is a critical aspect in the face of climate change and an increase in the frequency of extreme weather events. The authors propose modern methods of analysis that allow predicting the behavior of structures in different operating conditions, which makes this work relevant for specialists engaged in monitoring the condition of existing facilities. The style of presentation of the book is clear and accessible, which allows readers to easily assimilate complex technical concepts. The team of authors consists of experienced specialists who not only have deep knowledge in their field, but also know how to share them with others. This makes the book not just a textbook, but a real guide to the world of hydrotechnical design. The book will be of interest not only to professional engineers, but also to students studying hydraulic engineering and construction sciences. It can be the basis for coursework and thesis, as well as a useful resource for preparing for exams. Teachers will find in it a lot of materials for discussion in the classroom, which will make learning more exciting and productive . If you are looking for literature on the design of hydraulic structures, the "Underground contour of hydraulic structures" will be a real find for you This publication will not only enrich your knowledge, but also help you become a more confident specialist in your field. Do not miss this important work, which can change your approach to the design and operation of hydraulic facilities