AbstractTrivandrum is one of the fastest growing cities of South India. The degree of landscape modification being made along the coastal zone of this city will be reflected in the quantity and quality of the coastal water resources. To combat the present threats, like the excess groundwater extraction and reclamation activities in the coastal regions of Trivandrum district, it is necessary to develop a groundwater management model. These models, will aid to project the behaviour of coastal groundwater system with respect to the future environmental challenges and to evolve suitable measures to control the saltwater intrusion into coastal aquifers of Trivandrum. The area selected for study is from Karikkakom to Pozhiyur region towards south of the coastal belt of Trivandrum. The main objectives of this paper is to develop a numerical model for groundwater flow and contaminant transport using Visual modflow and SEAWAT and to predict the groundwater heads and extent of intrusion during 2011-2020 through scenario analysis.^p