The book "The theory of filtration diffusion and its application to the problems of hydrology and hydrogeology" by Kazansky A. It is a unique study that immerses the reader in the complex but fascinating world of hydrology and hydrogeology. This publication will be of particular interest to those who seek to understand how water moves through porous environments, as well as those who are engaged in practical tasks in the field of ecology, geology and engineering. Author, A. Kazansky is a recognized expert in his field, and his work is distinguished by a deep scientific approach and careful study of the material. The book discusses the basic principles of filtration diffusion, a process that plays a key role in the movement of water and solutes in soils and rocks. Kazansky not only explains the theoretical aspects, but also demonstrates how this knowledge can be applied to solve real-world problems, such as groundwater quality assessment, water resources management and forecasting the consequences of anthropogenic activities. The book will be useful to both undergraduate and graduate students studying hydrology and related disciplines, as well as practitioners working in the field of ecology, geology and engineering . It is suitable for those who are interested in modern methods of groundwater research, as well as for those who want to deepen their knowledge of the processes occurring in natural systems. If you are looking for literature that combines theory and practice, then this publication will be a real find for you. The topics raised in the book cover a wide range of issues related to filtration and diffusion, including mathematical modeling of these processes. Kazansky emphasizes the importance of understanding the interaction of water with the environment, which is critical for sustainable water management. His work highlights how inefficient use of these resources can lead to environmental disasters, and suggests ways to address these problems through a scientific approach. The author's style is distinguished by clarity and accessibility, which makes complex concepts understandable even for readers who do not have special training. Kazan masterfully combines theoretical calculations with practical examples, which allows the reader not only to assimilate the material, but also to see its application in real life. His previous work also deserves attention, in particular, research in the field of hydrogeology, which has been recognized both in academia and among practitioners. If you are looking for books on hydrology, hydrogeology, environmental management or mathematical modeling of natural processes, then “The theory of filtration diffusion and its application to the problems of hydrology and hydrogeology” will be an excellent addition to your library. This is not just a tutorial, but a real encyclopedia of knowledge that will help you to better understand how water systems function and how we can preserve them for future generations. In conclusion, the work of Kazansky is not just a book, but a whole world in which it is worth diving into everyone who is interested in the natural sciences and their application. It inspires further research and opens new horizons in understanding the complex processes taking place in our environment.