Environmental Hydraulics is the final end of the study of integrated cycle of water (water supply, wastewater collection and treatment, discharge in water bodies). The Course aims at providing both the theoretical knowledge and the methodological tools to model those processes in fluvial systems and to predict how the discharge of those substances ultimately affects water quality inside those systems. Contents: ? What is the Environmental Hydraulics ? Definitions, commonalities and differences with other cousin disciplines. ? Processes, substances, parameters, scales and methods in Environmental Hydraulics. ? Fluids properties. Continuum hypothesis, density, compressibility, surface tension, viscosity. ? Kinematics of fluids. Lagrangian/eulerian descriptions. Substantial derivative. Type of flows. ? Conservation laws for mass and momentum. Navier-Stokes equations ? Advection-diffusion equation ? Turbulent transport and mixing. The advection-diffusion equation for a turbulent flow. ? Application of scale analysis to river mixing.