What is a conceptual model?

A conceptual model is fundamentally a non-quantitative description that provides a simplified view of a system, helping to illustrate the structures and trends that govern its behavior. It serves as a framework for understanding how different components of a system interact and how various processes can influence outcomes. This type of model is particularly useful in the fields of environmental science and water quality management, where it can help stakeholders grasp complex systems without overwhelming detail.

In contrast, options that mention detailed quantitative analysis or physical representations focus more on data and specific measurements rather than the broader conceptual insights that a conceptual model provides. Predictive time series models also differ in their approach, as they rely on historical data and statistical methods to make future predictions, rather than serving as a general explanatory tool. Thus, the essence of a conceptual model lies in its ability to convey overarching ideas and relationships, making the correct choice particularly fitting.