ABSTRACT
This chapter introduces the basics of hydrologic mode. Typical hydrologic problems are associated with: surface-water flow; ground-water flow; and solute transport. In hydrology, as in virtually every other scientific field, the use of computers has revolutionized problem-solving techniques. The point to be made is that the computer is a useful data-analyzing tool, but the responsibility for conceptualizing the problem, selecting an appropriate program, compiling representative input data, and correctly evaluating data output rests squarely on the shoulders of the user. The computer involves the listing of iterative procedures used to solve the algebraic equations derived for the model. A computer program may be described as the package that can be used for some application without an intimate knowledge of how it was written. The computer model may be thought of as an extension of the numerical model. It involves the listing of iterative procedures used to solve the algebraic equations derived for the model.
