This unit describes the skills required to evaluate system performance and investigate and report on the optimisation of sedimentation and clarification processes.This unit applies to those working as technical staff with responsibility for optimising sedimentation and clarification processes in water and wastewater treatment plants. This role may be performed as a single operator, or as part of a team with some responsibility for team coordination and supervision, depending on the size of the treatment plant.The skills and knowledge described in this unit must be applied within the legislative, regulatory and policy environment in which they are carried out. Organisational policies and procedures must be consulted and adhered to.Those undertaking this unit would work under indirect supervision, while performing complex tasks, within a familiar context.No licensing, legislative or certification requirements apply to unit at the time of publication.