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To edit the data for a Horizontal Migration model select the Model Parameters menu item from the Data Entry menu. The Horizontal Migration form will be displayed.
This form has several tabs for editing the data for the model. Each of these tabs is described in the sections below.
This tab is for editing the title and selecting what layers are present in the model. The model may contain a geomembrane, clay liner, or aquitard.
This tab is used to specify the data for the source of contaminants. It is the same as the Source tab for Primary Liner Landfills and is described in that section above.
This tab is used to specify the hydraulic heads, infiltration in to the attenuation layer and distance between head measurements. The following parameters can be specified on this tab:
Infiltration in to Attenuation Layer: This is the downward infiltration due to precipitation in the attenuation layer. The infiltration will have the effect of removing contaminant by acting as a passive sink with inflow. To avoid this effect set the infilration into the attenuation layer to zero.
Head in the Waste: This is the head in the waste, relative to the same datum (depth) as the head in the attenuation layer.
Head in the Attenuation Layer: This is the head in the attenuation layer at a location outside of the barrier (liner system).
Distance between Head Measurements: This is the horizontal distance between the two head measurements above.
This tab is used to specify the data for the geomembrane. It is the same as the Geomembrane tab for Primary Liner Landfills and is described in that section above.
This tab is used to specify the data for the clay liner. It is the same as the Clay Liner tab for Primary Liner Landfills and is described in that section above.
This tab is used to specify the data for the aquitard. It is the same as the Aquitard tab for Primary Liner Landfills and is described in that section above.