The significant sources of contamination in groundwater are farming chemicals, septic waste, landfills, uncontrolled hazardous waste, storage tanks, and atmospheric pollutants. While in most cases these sources can be represented as a continuous source, contamination caused by accidental events (e.g., accidental spills, rupture of a tank) can often be represented as an instantaneous 'pulse' sources.

Develop a MAGNET model to simulate the plume migration originating from accidental spills for the following specific situation and perform a sensitivity analysis with respect to different ways of representing of the source

• instantaneous loading with a specified concentration
• instantaneous loading with a specified mass

Suggested Model Setup:

• 2D Model size: 200m x 50m;
• Driving head difference (left edge to right edge): 1m;
• initial plume size: 10m x 10m.
• Time step: 1 day

MAGNET/Modeling Hints:

• Use 'Synthetic Mode' to set up your flow model ( 'Other Tools' > 'Utilities' > 'Go to Synthetic Case Area').
• Conceptualize the model as 1-layer aquifer.
• Use line features as prescribed head boundaries to generate the head difference from the left edge to the right edge of the model.