The branch of science which focuses on the distribution, management and movement of water on Earth and other celestial bodies is known as hydrology. This includes a detailed analysis of water resources, water cycle and environmental watershed sustainability. The discipline of hydrology is divided into various sub-disciplines such as surface hydrology, hydrometeorology, drainage-basin management and hydrogeology. Hydrology finds application in a wide variety of fields such as disaster management, public health, power generation, civil engineering, etc. Systems and mechanism which make use of liquid fluid power for performing work are called hydraulic systems. They are capable of transferring large amounts of power through very small hoses and tubes. The key components of a hydraulic system are hydraulic pumps, actuators, control valves, accumulators, reservoirs, hydraulic fluids, filters, seals and pipes. The topics included in this book on hydrology and hydraulic systems are of utmost significance and bound to provide incredible insights to readers. It attempts to understand the multiple branches that fall under the discipline of hydrology and hydraulic systems, and how such concepts have practical applications. Those in search of information to further their knowledge will be greatly assisted by this book.