Evaluating Calibration of Groundwater Models

Stress-Response approach
- Conceptual arguments for separate steady-state and water-level change models
- Working example – PDVS Stress-Response Model
- Structure of PEST and MODFLOW files for,
  - Consistent hydraulic properties
  - Ease of visualizing arrays
  - General file management
- Building PEST control file with NoComment

Quantifiable calibration criteria, the objective function
- Water levels, water-level changes, discharges, and changes in discharge
  FORTRAN programs MOD2OBS, ZoneBudget, and MOD2BUD
- Expand objective function
  - Water-table altitudes greater than land surface, TrimSIM
  - Head-differences between wells, ObsDIFF
  - Transmissivities from aquifer tests, T-COMP
- Conceptual comparisons, Recharge volumes

Qualitative calibration criteria
- Visualize hydrogeologic framework in Model Viewer and Google Earth
- Show water table as upper surface in Model Viewer
- Map transmissivities and pilot points in Google Earth
- Creating hydrographs with Excel for display in Google Earth
- Creating water-level profiles in Excel