This text investigates the fundamental physical and mathematical principles governing the movement, distribution, and quality of water on Earth. Rafael L. Bras, a distinguished professor of civil and environmental engineering, utilizes a rigorous analytical framework to bridge the gap between empirical observation and theoretical modeling. The book provides a comprehensive foundation for students and professionals to understand hydrologic systems through the lens of fluid mechanics and thermodynamics.

Experts recognize this work as a foundational text for civil engineering curricula due to its technical depth and mathematical precision. Readers frequently note the academic density of the prose, which requires a strong background in calculus and physics to fully comprehend.