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Chapter 6 ANALYSIS & MODEL PERFORMANCE

MAGNET offers several tools for real-time analysis of model results and comparison with observations.
In particular, users can:

• Monitor head and concentration simulation outputs and compare with time-series measurements
at a discrete location.
• Compute water balances for a zone or set of zones
• Compare head measurements across space, either within the entire modeling domain or for a
subregion of the domain.

Each of these is explained in further detail in the following sub-sections.

6.1 Monitoring Well Time-Series and Breakthrough Curves

Monitoring wells are useful for visualizing time-series head and concentration data at a discrete location in
the model domain. Subsection 4.3.3 provided details on how to make any well feature a monitoring well.

As discussed in Section 5.4, to view Charts of model results, LM click on the ‘ViewResult’
button along the left-side of the MAGNET Modeling Environment, then select ‘Display
Charts’ from the pop-up menu. This launches five different charts, including the Monitoring Well plot..

An example of a using a monitoring well to generate a concentration breakthrough curve is shown in Figure
6-1. Note that the ‘Time’ axis is in units of days since the start of the simulation, and the ‘Concentration’
axis is in units of ppm.

An example of using a monitoring well to visualize time-series simulated head data is shown in Figure 6-2.
Again, the ‘Time’ axis is in units of days since the start of the simulation. Head is in units of meters.
The Monitoring well plot only shows the results of one monitoring well feature at a time. To show the
results for a different feature, use the drop down menu next to ‘Select MW:’ to select a different feature,
then click ‘ReDraw’ to update the plot.
Observations of head or concentration can be added to the Monitoring Well plot. See subsection 4.3.3 for
more details.

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