NHC conducted a Computational Fluid Dynamics (CFD) model study for the City of Terre Haute Wastewater Facilities Main Lift Station Replacement project. The objectives of the modelling were to validate the proposed design and then use the model to evaluate possible design modifications to improve the hydraulic performance of the facility. The study found that the initial design was affected by laterally unbalanced flow across both screen channels, which caused non-uniform flow approaching the pumps and increased potential for sedimentation. Surface, sidewall, and floor vortices within the wet wells were also found to occur. Improvements were focused on the operating condition with the worst hydraulic performance. Several modifications were identified including adding baffles upstream of the screens to redistribute velocities and fillets upstream of the pumps to minimize the potential for vortex activity. Each modification was shown to provide significantly higher likelihood of acceptable performance.