Abstract
A hydrogeological investigation was conducted to study the feasibility of raw water supply to a proposed reverse osmosis (RO) plant on New Providence Island, Bahamas. The study included field investigation and development of a SEAWAT model. After calibration, the model was used to evaluate the long-term water quality changes due to different withdrawal scenarios. Both wellfield and lake withdrawals were considered. The results indicate the raw water total dissolved solids (TDS) concentration would increase quickly due to vertical migration of salt from below. There is no significant difference to the simulated water quality changes between well or lake withdrawals.