The textbook of Open Channel Hydraulics for Engineers, also called Applied Hydraulics, emphasizes the dynamics of the open-channel flow, by attempting to provide a complete framework of the basic equations of motion of the fluid, which are used as building blocks for the treatment of many practical problems. The structure of the document, with seven chapters totally, follows a logical sequence from a description and classification of Fluid Mechanics and Open Channel Flows, as reviewed in Chapter 1. A development of the basic equation of motion for uniform flow is encountered in Chapter 2. Coming to Chapter 3, the fruitful concepts of specific energy and hydraulic jumps are introduced and developed. Chapter 4 presents a variety of non-uniform flows and applications of drawing water-surface profiles. Spatially-varied flow, found at spillways and weirs is considered in Chapter 5. Transitions and energy dissipators are discussed in Chapter 6. Finally, in Chapter 7, unsteady flow in open channels is introduced generally and an introduction to the method of characteristics is presented.