MLU for Windows User's Guide • Well flow modelling ... - Hydrology.nl

On the other hand MLU models have some important restrictions:• All layers are assumed homogeneous, isotropic and of infinite extent• Only groundwater flow resulting from pumping and injection wells can be modeled.Software capacityThe MLU software can handle:• 40 aquifers (layers) and 41 aquitards• 300 pumping/injection wells• 50 pumping periods per well• 50 observation wells• 100 measured drawdowns per observation well• 16 parameters to be optimized in one run.Data input• Interactive input• Data exchange with spreadsheets (copy & paste)• Modify MLU input data file (ASCII)• Time conversion: seconds, minutes, hours, days and years.Inverse modeling• Individual and grouped parameters can be determined in one run• Automated curve fitting is based on the Levenberg-Marquardt algorithm• Linear and log-transformed least squares solutions• Statistical data output includes standard deviations and correlation matrix• Parameter optimization and final output results in ASCII-files.Data output• Data exchange with spreadsheets (copy & paste)• MLU data file (ASCII)• Optimization results, including calculated and observed drawdowns (ASCII)• Data file that contains computed heads of displayed time graph (FTH-file)• Data file that contains computed drawdowns of displayed contour map (XYZ-file)• Data file that contains a MicroFEM finite element model (FEM-file).Graphical output• Linear, semi-log and log-log time graphs of drawdown or head• Time-variant aquifer discharge at a well screened over multiple aquifers• Animated contour plots of drawdown and build-up cones• Clipboard bitmap output and vector-based meta-file output.5