Groundwater Modeling

Figure 9.) A simulated model generated to represent the Castle Hayne aquifer's potentiometric contours in 1980 (Giese et al., 1992).

This model was generated using J.F. Devlin's excel spread sheet, downloaded during the Geol 552 course at the University of Kansas (2025). The hydrualic head boundaries (yellow on the left and right sides of the model) were estimated using the average hydraulic gradient of 5 to 15 feet per mile (Harned, Lloyd, and Treece 2025). They were also estimated with the potentiometric contours in figure 9. The thickness of the aquifer was assumed to be it's average of 185 feet (Trapp Jr. and Horn, 1997). The hydraulic conductivity was estimated using the range .42 to 31 feet per day (Lautier, 2001). The transmissivity was calculated with the hydraulic conductivity and the aquifer thickness. The Q value was estimated using the other values in the table. Two pumping wells were added to simulate the high volume of water pumped from the Castle Hayne aquifer (Trapp Jr. and Horn, 1997).