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values in the text boxes provided to use values different than the domain-wide inputs. If one of the radio
boxes is left unchecked, the domain-wide inputs will be used (see Figure 4-10).
4.2.3 Transport Property Attributes
Click on the ‘Transport Property’ tab title to access the Transport Property sub-menu (see Figure 4-9). This
sub-menu allows for assigning molecular diffusion and local dispersion coefficients potentially useful for
solute transport modeling. Check the radio box next to ‘Molecular Diffusion L’ and/or ‘Molecular Diffusion
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T’ and input non-zero molecular diffusion coefficients (units: m /day) to include lateral (L) and transverse
(T) molecular diffusion in the solute transport simulations. Similarly check the radio box next to ‘Local
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Dispersion L’ and/or ‘Local Dispersion T’ and input non-zero local dispersion coefficients (units: m /day)
to include lateral (L) and transverse (T) local dispersion in the solute transport simulations.
Solute source concentrations and extents can be added using zones and the Sources and Sinks tabs in the
Zone Attributes menu (see subsections 4.2.5 and 4.2.6).
Figure 4-11: Transport Property sub-menu (for Zone conceptual features).
4.2.4 Biochemical Attributes
Click on the ‘Biochemical’ tab title to access the Biochemical Property sub-menu (see Figure 4-9). This
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sub-menu allows for assigning retardation and 1 -order decay coefficients potentially useful for solute
transport modeling (see Figure 4-12). Check the radio box next to ‘Retardation’ to simulate the retardation
of a solute due to biochemical processes or soil:water partitioning. By default, a retardation factor of 1 is
used during simulation. Update the value in the text box next to ‘Retardation Factor’, or select the radio
box next to ‘Partitioning Kd:’ to use a partitioning coefficient to simulate partitioning of a solute to the
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solid (sorbed) phase during transport. If a soil density (g/m ) is known, check the radio box next to ‘Soil
Particle Density:’ and enter the known value in the provided text box.
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