ABSTRACT
This chapter presents the concept of mixing zone and near-field and far-field mixing. It discusses the mixing zone regulations designed to protect the aquatic life against lethality. In reality, a mixing zone is created in the vicinity of the outfall. The mixing zone is a region where complete mixing has not been achieved. The design of the discharge outfall should provide ample momentum to dilute the concentrations in the immediate contact area as quickly as possible. Studies on a simple jet resulting from a discharge from a round nozzle into a body of water have been extensive. One of the limitations associated with this model is using constant hydraulic geometry in the calculation. A field dye dispersion study is an expensive and time-consuming study to determine the mass transport coefficients, particularly the longitudinal and vertical dispersion coefficients.
