Surface Water Interaction Modelling Using Visual MODFLOW and GIS

PHYLARESResults and Discussion / ch.8_________________________________________________________________________________52Chapter 8Results and discussionIn this chapter the results or the model output are discussed and their interpretation is presented.8.1 Output from the modelGroundwater leaves the system through river leakage, pumping wells, constant head and drains.Table 8.1 and Figure 8.1 show the water balance of the steady state model. The water dischargedto the river by the groundwater is about 385.15 m 3 /d. This is in the order of 3%.8.1.1 Model Water balanceOne of the methods of expressing model results is through a water balance. Water balance dataprovide both an indication of the relative magnitude of flow components as well as a means tocheck that the model solution has remained stable. If there is an error in the iterative solutionthen it is likely to show up in the water balance. External stresses such as wells, areal recharge,drain and river are simulated to calculate the water budget of the total area (Fig 8.1). Flowbudget calculated to show the difference between the inflow and outflow in the model domain isindicated in Table 8.1. The water balance results have shown discrepancies of 0.00%. Becausethis is a steady-state simulation, no change in storage occurs.______________________________________________________________________________________Groundwater – Surface water interaction modeling using visual MODFLOW and GIS