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To edit the data for a Primary and Secondary Liner Landfill model select the Model Parameters menu item from the Data Entry menu. The Primary and Secondary Liner Landfill 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 primary geomembrane, primary clay liner, secondary geomembrane, secondary clay liner, aquitard, or aquifer. A secondary leachate collection system is always assumed to exist in this landfill model. In addition, the units to store the data needs to be specified as metric or Imperial.
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.
To calculate the Darcy velocity through the liners the hydraulic heads must be specified in this tab. The following data can be edited on this tab:
Leachate Head on Primary Liner: The leachate head above the primary liner.
Leachate Head on Secondary Liner: The leachate head above the secondary 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.
This tab is used to specify the data for the primary 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 leakage through the primary geomembrane. It is the same as the Leakage tab for Primary Liner Landfills and is described in that section above.
This tab is used to specify the data for the primary 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 secondary leachate collection system. The following parameters can be edited on this tab:
Name: This is the name of the secondary collection system. It is used only for drawing.
Symbol: This is the symbol used to draw the secondary collection system. To change the symbol click on the Change Symbol button. A Change Symbol form will be displayed where you can change the bitmap library, bitmap, foreground color, background color, and fill size for the symbol.
Thickness: This is the thickness of the secondary collection system.
Density: This is the density of the secondary collection system.
Equivalent K: The is the equivalent hydraulic conductivity of the secondary collection system. If you are unsure what the value of this is, it is recommended to use a leakage rate landfill.
Diffusion Coefficient: This is the coefficient of hydrodynamic dispersion for the secondary collection system.
Distribution Coefficient: This is the distribution coefficient for the secondary collection system.
Porosity: The porosity of the secondary collection system.
This tab is used to specify the data for the secondary 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 leakage through the secondary geomembrane. It is the same as the Leakage tab for Primary Liner Landfills and is described in that section above.
This tab is used to specify the data for the secondary 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.
This tab is used to specify the data for the aquifer. It is the same as the Aquifer tab for Primary Liner Landfills and is described in that section above.
After this all of the information on the previous tabs has been entered the minimum horizontal outflow velocity in the aquifer will be calculated. You will then have the option of using this velocity or a higher velocity. It is the same as the Outflow Velocity tab for Primary Liner Landfills and is described in that section above.