Professional elective that in any offering may include various combinations of the following topics:- river morphology, river engineering and stream remediation; models for channel and river routing; model theory, selection, calibration, validation and reliability; models may include Muskingham, kinematic wave, non-inertial and diffusion and dynamic wave; sediment and pollutant transport methods and models including plug-flow and advection-dispersion in both coupled and uncoupled applications; hydraulic control structures; estuarine classification and density structure; tides, water level response, mixing processes and flushing of rivers and estuarties; hydrodynamic stratification and algal dynamics; random walk and box models; biochemical processes in rivers and estuaries.