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The U.S.G.S. Modular Ground-Water Flow Model: Designed to be Understood and Adapted

by Michael G. McDonald, US Geological Survey, Water, Resources Div, Reston, VA, USA,
Arlen W. Harbaugh, US Geological Survey, Water, Resources Div, Reston, VA, USA,



Document Type: Proceeding Paper

Part of: Hydraulics and Hydrology in the Small Computer Age

Abstract:

The paper discusses a carefully designed model program and its complementary complete description of all of the physical and mathematical concepts used in the model. The model program consists of a series of independent subroutines called modules. Modules are grouped by hydrologic function into 'packages. ' A report describing the model was written in three levels. At one level the hydrologic concepts on which the model is based are explained. The second level describes how the concepts were incorporated into the program. The third level describes specific modules in sufficient depth to permit modifications to the model.

Subject Headings: Hydrologic models | Computer models | Mathematical models | Groundwater flow | Computer programming | Physical models | Flow simulation

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