PART 1 Introduction to Open Channel Floes; Introduction; Fundamentals of open channel flows.; PART 2 Turbulent Mixing and Dispersion in Rivers and Estuaries: An Introduction; Introduction to mixing and dispersion in natural waterways; Turbulent shear flows; Diffusion: basic theory; Advective diffusion; Turbulent dispersion and mixing: 1 Vertical and transverse mixing; Turbulent dispersion and mixing: 2. Longitudinal dispersion; Turbulent dispersion in natural systems; Mixing in estuaries: Part 2 Revision exercises; PART 3 Introduction to Unsteady Open Channel Flows; Unsteady open channel flows: 1. Basic equations; Unsteady open channel flows: 2. Applications; Unsteady open channel flows: 3. Application to dam break wave; Numerical modelling of unsteady open channel flows; Revision exercises. PART 4 Interactions between Flowing Water and its Surroundings: Introduction; Interaction between flowing water and solid boundaries: sediment processes; Interaction between flowing water and free surfaces: self -aeration and air entrainment.