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The approaches to the study of hydrological issues are generally divided into two very different groups: (1) the physical approach; and (2) the system approach (Singh 1988). The physical approach is motivated primarily by scientific study and understanding of the physical phenomena, whereas the practical application of this knowledge to engineering and water resources management is recognized but not always fully required. Unlike detailed physical studies of each hydrological problem, the system approach is driven by the need to establish working relationships between measured parameters for solving practical hydrological problems. This approach simplifies the issue because it is unfeasible to consider the entire physical system. Therefore, a logical approach consists of measuring those variables in the hydrologic cycle, which appear significant to the problem, and establish explicit mathematical relationships between them.

Simplified Conceptual Structures and Analytical Solutions for Groundwater Discharge Using Reservoir Equations