Decision Support System for Sustainable Water Supply (2006, order #91107), a collaborative project with National Water Research Institute, describes a water-balance tool called Water Evaluation and Planning System (WEAP). Its purpose is to support water planners, stakeholders, and decision makers in developing a range of alternative water management scenarios and exploring the comparative advantages and disadvantages of each. Users can link water management simulations in WEAP to the EPA water quality model Qual2K and to the groundwater hydrology model MODFLOW.