The four steps required to define a Source are as follows:
1. Specify the Level of Containment of the Source. This consists of defining the Number of Packages into which the mass in the Source is to be discretized, and the Number of Barriers defined for each package.. The Number of Packages represents the number of discrete containers represented by the Source. Inventories (the amount of contaminant mass in the Source) are defined per package. The primary purpose of discretizing the Source into packages is to facilitate simulation of barrier failure (containment). Packages can be defined to have no barriers (e.g., soil disposed of directly in a trench), a single barrier (e.g., waste disposed of in drums); or a double barrier (e.g., an engineered waste package containing one or more secondary containers inside).
2. Define the inventories in each package in the Source. An inventory consists of a vector of species masses in a specific location relative to the barriers (e.g., inside the outer barrier, inside the inner barrier). Inventories can be optionally specified as being bound within a waste matrix (in which case a matrix degradation rate must be specified). Multiple inventories can be defined for a Source.
3. Define the Associated Cells for the Source. Associated Cells are specialized Cell pathways which are associated with the Source and are used to simulate the transport of mass through and away from a Source.
4. If you have specified that your Source has barriers, define the barrier failure distributions. Failure distributions must be defined for each barrier you have specified.
The editing dialog for a Source is shown below:
Note that a Source element is actually a specialized type of Container. This can be recognized by the triangle in the upper left-hand corner of the element:
Sources have Graphics and Information tabs associated with all Containers. Source Containers can also be localized
The Associated Cells for the Source element are defined by inserting them inside the Source Container.
The detailed steps required to define a Source are discussed in detail in the topics listed below.
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Defining the Level of Containment