areas. Recent applications of TELEMAC throughout the Europe include the works from Abadie et al. (2008), Herbert et al. (2011); Monteiro et al. (2011) and Bedri et al. (2011).
Due to the availability, TELEMAC2D was adopted and employed in the present study, as the first study of this kind for this region, to model the hydrodynamics and pollutant transport and to assess the impacts of treated wastewater discharge on the surrounding area of the outfall with the normal operational conditions of both wastewater treatment and reclaim water plants, and two accidental operational conditions. Two popular control indexes for water quality, namely CODMn and inorganic nitrogen are considered as the assessment factors. The depth-averaged hydrodynamics and the concentrations of the pollutants are modelled by TELAMAC2D under 3 scenarios, consisting of the normal operational condition and two accidental operational conditions of a wastewater treatment plant and a wastewater reclaimed plant. The distributions of the pollutants and the affected areas are studied, so that water quality in the area can be assessed and high risk areas are identified. It is hoped that the model used in this study can provide the essential and detailed information to support the decision making for the project planning and marine environment risk management.