Chapter 2 – Modeling Purpose and Conceptual Model

The modeling purpose underlies all subsequent steps in groundwater modeling. The purpose is defined by posing a question, or set of questions, which the model is designed to address. Most commonly the purpose is to forecast a response to changes in current conditions. The conceptual model, which provides a qualitative framework for designing a numerical model, is a descriptive representation of a groundwater system based on what is known about the modeled area. Development of a site conceptual model involves the synthesis of regional, site, and generic hydrogeologic and other relevant information. A conceptual model includes information on system boundaries; hydrostratigraphy; flow directions and sources and sinks; and a field-based estimate of water budget components. Uncertainty is addressed by updating and revising the conceptual model and/or formulating alternative conceptual models.

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