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To edit the source and hydraulic head data for a model click on the Source and Hydraulic Heads tab on the left side of the model form.

 

 

The following can be specified on this tab:

 

Source

 

Concentration: This is the concentration for the source. It can either be a constant concentration or the initial concentration depending on the source type.

 

Landfill Length: This the length of the landfill in the direction of groundwater flow.

 

Landfill Width: This is the width of the landfill perpendicular to groundwater flow.

 

Source Type: This option is used to specify the top boundary condition, it can be either Constant Concentration or Finite Mass

 

If the source type is Finite Mass the following data can also be edited:

 

Waste Thickness: This is the vertical thickness of the waste, and is used to calculate the mass of contaminant per unit area of waste.

 

Infiltration: The average infiltration through the landfill cover.

 

Waste Density: This is the apparent density of the waste (i.e. mass of waste per unit volume of the landfill).

 

Percentage of Mass: The available (leachable) mass of contaminant in the waste per unit mass of waste (eg. mass of chloride in waste/total mass of waste).

 

 

Hydraulic Heads

 

Leachate Head on Primary Liner: The leachate head above the primary liner.

 

Groundwater level relative to top of aquifer: The groundwater level relative to the top of the aquifer, or if no aquifer is present the hydraulic gradient in the liner.