The calibration of MT3D was achieved by adjusting the values of advection and dispersion values.
The average coefficient of determination ([R.sup.2]) for the selected piezometers for calibration and validation period was calculated as 0.89 and 0.87 (Figures 6 and 7) for MODFLOW and MT3D models, respectively, which indicated a close agreement between the calculated and measured groundwater head.
The dispersivity values used in the MT3D model are given in Table 4.
The MODFLOW and MT3D models were calibrated for the period of 2003-2007 and validated for the years 2008-2012 using the measured groundwater level and quality data, respectively, for regional groundwater management in Punjab province of Pakistan.
It is also recommended that the detailed field survey is required to determine the exact advective and dispersive solute transport parameters for more accurate results of MT3D model.
Hatamleh, "Using Modflow and mt3d groundwater flow and transport models as a management tool for the Azraq groundwater system," Jordan Journal of Civil Engineering, vol.