A protection strategy in environmental management such as groundwater vulnerability mapping is a powerful tool for decision making and land use planning. Groundwater vulnerability evaluates a multilayer system over a large basin. It has a large and complex data and variables. Geographical Information System (GIS) provides an easy means to analyze large and complex groundwater data. These complexities also necessitate a systematic approach such as Multi Criteria Decision Making (MCDM) for decision analysis in a framework that supports hydrogeological spatial attributes as well as facilitates...