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Simulation of Ground-Water Flow in the Coastal Plain Aquifer System of North Carolina:<br>USGS Professional Paper 1404-M

The purpose of this report is to describe the simulation of ground-water flow in the Coastal Plain of North Carolina for conditions prior to and after development of ground water. A finite-difference ground-water flow model was applied to 10 aquifers and intervening confining units, each of which covers all or part of the State's 25,000 square mile Coastal Plain. Discussions include modeling procedures and boundary conditions, calibration, sensitivity analysis, steady state for pre-pumping conditions, and transient simulations for 1900-80 conditions.

Results of the simulations are discussed with respect to changes in ground-water flow as shown by changes in the water budget, potentiometric surface of each aquifer, and direction of ground-water flow vertically through the confining units. Results are also presented for a simulation of the year 2000 using an assumed constant increase in pumping of 3 percent per year from 1980 to 2000 at all 1980 pumping locations.

By G.L. Giese, J.L. Eimers, and R.W. Coble, 1997. 142 pages.




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