Under administrative direction, performs functions of the agency involving analysis and modeling of environmental, production, and water quality data, forecast/simulation modeling of short-term and long-term water supply, modeling of surface and ground water flow systems at various spatial and temporal scales, and participates in long-term water supply planning activities. Employees in this category have knowledge and understanding in the areas of surface-water, groundwater, hydrogeology, water quality, water resources management, hydrologic and hydraulic modeling, numerical, analytical, and statistical concepts and methods, uncertainty and risk analysis, and water supply planning principles.  Knowledge on systems optimization and stochastic hydrology is highly desirable. Perform