ABSTRACT
A conceptual model of a hydrologic system is a clear, qualitative, physical description of the operation of the system. A hydrologist’s conceptual model of the system determines the direction, focus, and speci˜c content of the investigation. The model consists of maps and cross-sections showing the subsurface geology, location of potential sources of recharge, £ow paths, and discharge. If the conceptual model does not accurately represent the operation of the real hydrologic system, then the results of the investigation will be at best misleading and at worst grossly in error. The conceptual model should be considered as subject to change or modi˜cation as new hydrologic information becomes available during the course of the project. The steps for developing a conceptual model are as follows:
1. Determine the type and distribution of groundwater recharge areas: in˜ltration from precipitation and surface-water bodies, from irrigation, as well as leakage or in£ow from other aquifers or adjacent areas.
