Surface Water Interaction Modelling Using Visual MODFLOW and GIS

PHYLARESModel calibration / ch.7__________________________________________________________________________________________497.2 Calibrated Aquifer Parameters7.2.1 Hydraulic conductivityCalibrated hydraulic conductivities are shown in Table 7.2. The optimum hydraulic conductivityvalues for the various hydrogeologic units were taken from the literature (Solomon, T, 2006) andare indicated in Table --. Layer 1 was calibrated at a horizontal Hydraulic conductivity value of15 m/d and vertical hydraulic conductivity of 1.5 m/d. Layer 2 was calibrated at 6 and 0.6 m/d asthe vertical and horizontal hydraulic conductivities respectively. Layer 3 was calibrated at 5 m/dand 0.5 m/d for the horizontal and vertical hydraulic conductivities respectively. The initialvalues for the calibration of hydraulic properties were taken from past literature of Solomon T,2007.Table 7. 2Calibrated Hydraulic conductivity values for the three layersItem Layer 1 Layer 2 Layer 3Horizontal Hydraulic conductivity15 6 5(m/d)Vertical Hydraulic conductivity(m/d)1.5 0.6 0.57.2.2 Water levelsModel water levels and measured water levels are compared. Each red dot in Figure 7.2 plots anobservation well’s simulated water level with field-measured water level. A perfect match wouldplot along the blue line. The RMSE as seen is 0.094 meters.______________________________________________________________________________________Groundwater – Surface water interaction modeling using visual MODFLOW and GIS