Delineation: This involves the characterization of the existing conditions so that people can have an adequate understanding of the hydrogeological conditions and a detailed spatial characterization of the saltwater interface | Monitoring: It involves a monitor program that can monitor conditions and provide a reasonable accurate assessment of the changes in the saltwater interface | Modeling: It is the use of Numerical modeling to predict long-term behavior of saltwater interface in response to changes in rainfall, water use and other activities or actions, which affect groundwater | Modification: Based on the results provided in the other three steps. There must be a modification of the pumping and control runoff or re-injection of wastewater to maintain the freshwater head to prevent further encroachment of saltwater |