Specifying Failure Distributions for Barriers

For both outer and inner barrier failure, there are six possible failure distributions that can be specified:

• Uniform;
• Weibull;
• Exponential;
• User-Defined;
• Immediate; and
• Table.

These six distribution types are described in the topics below. The mathematical details of these distributions are presented in Appendix E of the Contaminant Transport Module User’s Guide.

Note: For all of the distributions (except the User-Defined), the parameters describing them should not be specified as functions of time (if they are, only the initial values will be used).