Guide to Hydrological Forecasts. Issue I: Long-term forecasts of elements of the water regime of rivers and reservoirs" is a unique publication created by the team of authors, which is a valuable resource for specialists in the field of hydrology, ecology, water management and related disciplines. This book will be an indispensable assistant for those who seek a deeper understanding of the dynamics of water resources, as well as for those who are engaged in the prediction and management of water systems. In the first issue of the Guide to Hydrological Forecasts, the authors offer the reader a detailed analysis of methods and approaches to long-term forecasting of the water regime of rivers and reservoirs. The importance of this topic cannot be overstated: given global climate change and increasing anthropogenic pressures on water resources, accurate forecasts are becoming necessary for the effective management of water systems. The book covers a wide range of issues, ranging from the theoretical foundations of hydrology to practical recommendations for the use of various forecasting methods. For whom is this guide written? It will be especially useful for students and graduate students studying in specialties related to natural sciences, as well as practitioners working in the field of hydrology, ecology and water management. Researchers and scientists dealing with water regime problems will find in the book a lot of useful information that will help them in scientific work and the development of new approaches to forecasting. The topics raised in the book cover not only theoretical aspects, but also practical examples, which makes the material available to a wide audience. The authors emphasize the importance of integrating different forecasting methods, such as statistical, mathematical and numerical models. They also discuss the impact of climate change on the water regime, making the book relevant in light of current environmental challenges. The style of the authors is distinguished by clarity and logical presentation, which allows the reader to easily assimilate complex concepts. They use a lot of illustrations and graphics, which makes the material more clear and understandable. The book also includes an extensive list of literature that will allow interested readers to delve deeper into the study of topics covered in the text. The Hydrological Projections Guide not only expands the horizons of knowledge about water resources, but also emphasizes the importance of their rational use. In the face of growing environmental problems and water scarcity, this publication becomes an important contribution to the scientific community and practical activities. Readers interested in environmental issues, sustainable development and natural resource management will find many valuable ideas and recommendations in this book. If you’re looking for information on hydrology, water regime prediction, or water management, this guide will be your reliable companion in the world of science. It can also be useful for those interested in climate change and its impact on ecosystems. Do not miss the opportunity to get acquainted with this unique edition, which opens new horizons in understanding the water regime and its prediction.